The AHA Wiki is great for some stuff. In the good news section, they have the last eight years worth of first place, Gold Medal homebrew recipes for each of the BJCP categories.
In the not-so-good news section, they make it unneccessarily hard to find the gold medal recipes on their website, and after you've finally found them you need to weed through all eight years to find the one and only Belgian Dubbel recipe that medaled. Or you may end up sifting through all eight years only to find out that that a Brown Porter never got the gold in the Porter category because the Robust Porters and Baltic Porters always win; so you need to keep looking for that superb Brown Porter recipe elsewhere. You'll find that there are 12 sub-categories that haven't struck gold.
I decided to help them get organized, so here you go. The following list has the Gold Medal-winning recipe in each category of the AHA National Homebrew Competition (NHC) for the last eight years. The list of BJCP categories changed in 2005, so I've tried to fit the earlier entries where they make sense in the current categories.)
The AHA Gold Medal-winning recipes for 2012 has been announced, but the recipes have not been posted on the AHA website as of yet. I'll update my list when they become available.
BJCP 1A Lite American Lager
2009 O'Bama-Lot
2008 Billy Bob Mississippi Lager
2006 Champagne Lager
BJCP 1B Standard American Lager
2005 Standard American Lager
2004 Dougweiser
BJCP 1C Premium American Lager
(No gold medal winners in this category in the last eight years.)
BJCP 1D Munich Helles
2011 Viking Gold
2007 Munich Helles
BJCP 1E Dortmunder Export
2010 461 Dortmunder Export
BJCP 2A German Pilsner
2006 Drei Liebchen Deutsche Pils
2004 Edmontoner
BJCP 2B Bohemian Pilsner
2011 Stop Looking For Malt Complexity In Pilsners
2010 BoPils
2008 Liquid Sunshine
BJCP 2C Classic American Pilsner
2009 Classic American Pilsner
2007 Classic American Pilsner
2005 Golden Era Lager
BJCP 3A Vienna Lager
2011 Vienna Lager
2008 Vienna Lager
2005 Little Vienna
2004 Vienna Eh? III
BJCP 3B Oktoberfest/Märzen
2010 Maerzen
2009 Oktoberfest Hallertau
2007 GB Märzen
2006 Oface Ofest
BJCP 4A Dark American Lager
2009 Danny's Bock
2006 Dark American Lager
BJCP 4B Munich Dunkel
2010 Tara's Slam Dunkel
2008 Munich Dunkel
BJCP 4C Schwarzbier
2011 Black Saxon
2007 Schwarzbier
2005 Let the Schwarz Be With You (recipe not available)
2004 Dark Helmet Schwarzbier
BJCP 5A Maibock/Helles Bock
2008 Helles Bock
2005 Heilige Helles
BJCP 5B M Traditional Bock
(No gold medal winners in this category in the last eight years.)
BJCP 5C Doppelbock
2007 Doppelbock
BJCP 5D Eisbock
2011 Tri-Paul-Bock
2010 Isebock
2009 Eisbock
2006 Dominator
2004 EKU
BJCP 6A Cream Ale
2008 Kari's Cream Ale
2006 Cream Ale
2011 $12 Cream Ale
BJCP 6B Blonde Ale
2004 Sweetheart Blonde
BJCP 6C Kölsch
2010 Helios Kölsch
2007 Kölsch
2005 Summer Kölsch
2004 Köelschde Toro
BJCP 6D American Wheat Or Rye Beer
2009 Bye, Bye, Miss American Rye
BJCP 7A North German Altbier
2006 Strike Team Chanukah Altbier
2005 Northern German Altbier
BJCP 7B California Common Beer
2010 NJ Steam 143
BJCP 7C Düsseldorf Altbier
2011 Daily Bread German Ale
2009 Dusseldorf Alt
2008 SummersALT
2007 JZ Alt
BJCP 8A Standard/Ordinary Bitter
2008 Standard/Ordinary Bitter
2004 Ordinary Bitter
BJCP 8B Special/Best/Premium Bitter
2011 ESB
2006 Bob's Bitter
2005 True Brit
BJCP 8C Extra Special/Strong Bitter (English Pale Ale)
2009 Guvnah
2009 ESB
2007 Bears Bitter
BJCP 9A Scottish Light 60/-
2007 Scottish Light 60/-
2005 Scottish 60/-
BJCP 9B Scottish Heavy 70/-
2011 Brown Eyed Woman
2009 Scottish Heavy 70/-
2006 Sand Hill Scottie
BJCP 9C Scottish Export 80/-
2004 Export 80/-
BJCP 9D Irish Red Ale
(No gold medal winners in this category in the last eight years.)
BJCP 9E Strong Scotch Ale
2010 Scotch Bingerson's Rehydration Fluid
2008 If It Ain't Scottish, It's Crap Scotch Ale
2004 Fat Bastard Wee Heavy
BJCP 10A American Pale Ale
2010 Opening Day Pale Ale
2009 Lara Pale Ale
2008 Lara Pale Ale
2007 Amarillo Pale Ale
2006 Drunk Monk Pale Ale
2005 Screaming Viking Pale Ale
BJCP 10B American Amber Ale
2011 Amber Waves Of Grain
2004 Drunk Monk Amber Ale
BJCP 10C American Brown Ale
2004 Janet's Brown Ale
BJCP 11A Mild
2010 Thomas Toes Mild
2009 Modest Mild
BJCP 11B Southern English Brown Ale
2007 Southern English Brown Ale
2005 English Brown Ale
BJCP 11C Northern English Brown Ale
2011 Northern English Brown Ale
2008 Nutty Professor Ale
2006 Nut Brown
BJCP 12A Brown Porter
(No gold medal winners in this category in the last eight years.)
BJCP 12B Robust Porter
2011 Dreaded Robust Porter
2009 Robust Porter
2008 Robust Porter
2007 Robust Porter
2005 Black Hills Porter
2004 Rocket Rod Romanaks Positively Porter
BJCP 12C Baltic Porter
2010 Three Kings Baltic Porter
2006 Baltic Porter
BJCP 13A Dry Stout
(No gold medal winners in this category in the last eight years.)
BJCP 13B Sweet Stout
(No gold medal winners in this category in the last eight years.)
BJCP 13C Oatmeal Stout
2010 Oatmeal Stout
BJCP 13D Foreign Extra Stout
2009 Redridge Stout
2004 West Indian Viagra
BJCP 13E American Stout
2008 Fostag Stout
BJCP 13F Russian Imperial Stout
2011 Badenov Russian Imperial Stout
2007 Leap Second Imperial Stout
2006 Russian Imperial Stout
2005 Veronica's Imperial Stout
BJCP 14A English IPA
2009 Blitzkrieg Hops
2005 13 Mile IPA
BJCP 14B American IPA
2011 Tsunami IPA
2007 Longbrook IPA
2006 Chicken Creek IPA
2004 Inaugural IPA
BJCP 14C Imperial IPA
2010 Hop-Fu
2008 Pliny The Elder Clone
BJCP 15A Weizen Weissbier
2009 El Hefe
2008 England-Weizen
2005 Hefeweizen
BJCP 15B Dunkelweizen
(No gold medal winners in this category in the last eight years.)
BJCP 15C Weizenbock
2007 Bitezen Bock
BJCP 15D Roggenbier (German Rye Beer)
2011 Roggen
2010 Roggen
2006 Peter Nelson's RoggenBier
BJCP 16A Witbier
2011 Witbier
2006 Witbier
2005 Witbier
BJCP 16B Belgian Pale Ale
(No gold medal winners in this category in the last eight years.)
BJCP 16C Saison
2010 Saison Lite 139
2007 Saison d'Ete
BJCP 16D Biere de Garde
(No gold medal winners in this category in the last eight years.)
BJCP 16E Belgian Specialty Ale
2009 Belgian Specialty Ale
2008 100% Brettanomyces
2004 Sorval
BJCP 17A Berliner Weisse
2008 Berliner Weisse
2004 Will Othe Wisp Weisse
BJCP 17B Flanders Red Ale
2010 Zed's Dead Red
2007 Flanders Red Ale
2004 Flanders Red Ale
BJCP 17D Flanders Brown Ale (Oud Bruin)
(No gold medal winners in this category in the last eight years.)
BJCP 17D Straight (Unblended) Lambic
2006 Throwing The Dice Again
2005 Oh to Daisy
BJCP 17E Gueuze
2011 You Snooze You Gueuze
BJCP 17F Fruit Lambic
2009 Ms. Helen's Peche Passion
BJCP 18A Belgian Blonde
2010 Sully's Belgian Blonde
BJCP 18B Belgian Dubbel
2009 Belgian Dubbel
BJCP 18C Belgian Tripel
2008 Have A Nice Tripel
2004 hmmm...Tripel IV
BJCP 18D Belgian Golden Strong Ale
(No gold medal winners in this category in the last eight years.)
BJCP 18E Belgian Dark Strong Ale
2011 Chimayo Azul
2007 Belgian Dark Strong
2006 Belgian Strong Dark Ale
2005 Blunt Trauma
BJCP 19A Old Ale
2006 Old Ale
2004 Big Mo
BJCP 19B English Barleywine
2010 JJs Barleywine
2004 English Style Barley Wine
BJCP 19C American Barleywine
2011 Neural Rust Barleywine
2009 Creative Destruction Barleywine
2008 Cheap Leather Jacket Barley Wine
2007 Old Blood & Guts - California
2005 Arrogant Barrister
BJCP 20 Fruit Beer
2011 Hop Fruity
2010 Peaches-n-Cream Hefe
2009 Thanks, Curt (Blackberry Baltic Porter)
2008 It's All Mine So Keep Back (Berliner Weisse With Sour Cherries)
2007 Summer Breeze (American Wheat Beer with Apricot)
2006 Blackberry & Cream (Cream Ale with Blackberry)
2005 Kölsch Abuse
2004 Raspberry Wheat
BJCP 21A Spice Herb Vegetable Beer
2011 Stefs Olive Beer
2010 Zingibier (Belgian Strong Wheat Ale with Ginger and Spices)
2009 Mashing Pumpkins Spiced Saison
2008 American Wheat Ale With Lemon Verbena
2007 Mild Jalapeño Pepper Beer
2006 Vanilla Cream Stout (Sweet Stout with Vanilla Bean)
2005 Hot Chihuahua
2004 Peppered Honey Wheat
BJCP 21B Christmas Winter Specialty Spiced Beer
(No gold medal winners in this category in the last eight years.)
BJCP 22A Classic Rauchbier
2011 Smoke Screen (Classic Rauchbier)
2009 Brisket In A Bottle
2006 Classic Rauchbier
2004 Rolling Rauch
BJCP 22B Other Smoked Beer
2008 Burnin' Down The House Smoked Weizenbock
2007 Dare to Roeselare (Flanders Red Ale Aged in Oak)
2005 Love Potion #9
BJCP 22C Wood Aged Beer
2010 Spanish Cedar IPA
BJCP 23 Specialty Beer
2011 Urban UFO
2010 Old Ale With Grapes And Honey
2009 Janet’s Brown Ale (Imperial American Brown Ale)
2008 Ben Franklin's Ale Colonial Stock Ale With Molasses And Spruce Tips
2007 Chipotle Pepper Alder Smoked Bock
2006 Garden Gruit
2005 Bellringer
2004 Eye Opener Stout
Here are the AHA Wiki pages for each year: