By request, a game system rundown, to the best of my knowledge (I don't have many of these products, so couldn't swear whether some borderline cases fall on one side of the line or the other.)
Best Fan Site
www.Againsttheshadow.org - d20 / Midnight
buffy.velvet-edge.com - Buffy (cinematic Unisystem)
www.d20srd.org - um, d20?
www.modus-operandi.co.uk - Mostly for Spycraft
www.planewalker.com - Planescape
Honorable mention: www.paranoia-live.net/news.php - Paranoia
Best Cartography
City State of the Invincible Overlord (Necromancer Games) - d20 fantasy
Dungeons of Doom (Green Ronin Publishing) - no system
e-adventure Tiles Dungeon Details vol 2 (Skeleton Key Games) - no system, but sized for d20
Temple Quarter: A City Quarters Sourcebook (The Game Mechanics) - d20 fantasy
World Map of Greyhawk (Paizo Publishing) - no system, but a D&D property
Honorable mention: Hudson City: The Urban Abyss (Hero Games) - HERO
Best Art, Cover
The Authority (Guardians of Order) - A tri-stat based game.
Beyond Countless Doorways (Malhavoc Press) - d20 fantasy
Blue Rose (Green Ronin Publishing) - OGL based on d20
Ex Machina (Guardians of Order) - A tri-stat based game
Paranoia XP (Mongoose Publishing) - Paranoia
Honorable mention: Iron Kingdoms Character Guide-Full Metal Fantasy Vol 1 (Privateer Press) - d20 fantasy
Best Art, Interior
Dark Legacies Players Guide (Red Spire Press) - d20
Dreaming Cities (Guardians of Order) - Tri-stat
Monte Cook's Arcana Evolved (Malhavoc Press) - OGL based on d20
Vampire: the Requiem (White Wolf Publishing) - new WoD storyteller
World of Darkness Ghost Stories (White Wolf Publishing) - new WoD storyteller
Honorable mention: Ars Magica 5th Edition (Atlas Games) - Ars Magica
Best Production Values
Ars Magica 5th Edition (Atlas Games) - Ars Magica
The Authority (Guardians of Order) - Tri-stat based game
Warhammer Fantasy RPG (Black Industries) - WFRP 2.0
Werewolf: The Forsaken (White Wolf Publishing) - new WoD storyteller
X-Crawl Color Edition (PandaHead Productions) - d20 fantasy
Honorable mention: Red Star (Green Ronin Publishing) - d20 modern (with many liberties)
Best Writing
Iron Kingdoms World Guide: Full Metal Fantasy Vol 2 (Privateer Press) - d20 fantasy
Meddling Kids (Pandahead Productions) - ? (Their own, I assume)
Murchad’s Legacy (Parent’s Basement Games) - ? (d20 fantasy, I assume)
Valus (Different World Publications) - d20 fantasy
World of Darkness Core Book (White Wolf Publishing) - new WoD storyteller
Honorable mention: Beyond Countless Doorways (Malhavoc Press) - d20 fantasy
Best Rules
Advanced Bestiary (Green Ronin Publishing) - d20 fantasy
Ars Magica 5th Edition (Atlas Games) - Ars magica
Blue Rose (Green Ronin Publishing) - OGL based on d20
Burning Wheel (Burning Wheel) - Burning Wheel
Capes (Muse of Fire Studio) - Capes
Honorable mention: The World of Darkness: Storytelling System Rulebook (White Wolf Publishing) - new WoD storyteller
Best Adventure
DCC 11: The Dragon Fiend Pact (Goodman Games) - d20 fantasy
Maure Castle: Dungeon Magazine #112 (Paizo Publishing) - D&D
Slavelords of Cydonia (Bad Axe Games) - Grim Tales (d20)
Trouble at Durbenford (Necromancer Games) - d20 fantasy
Villiany Amok (Hero Games) - Hero/Champions
Honorable mention: Danse de La Mort parts1-8 (White Wolf Publishing) new WoD storyteller
Best Adversary/Monster Product
Advanced Bestiary (Green Ronin Publishing) - d20 fantasy
Foes of Freedom (Green Ronin Publishing) - Mutants & Masterminds
A Magical Soceity Beast Builder (Expeditious Retreat Press) - d20 fantasy
Monster Burner (Burning Wheel) - Buring Wheel
Old World Bestiary WFRP (Black Industries) - WFRP 2.0
Honorable mention: Master and Minions 1: Swarm of Stirges (Behemoth3) - d20 fantasy
Best Campaign Setting/Setting Supplement
Black Company (Green Ronin Publishing) - d20 fantasy
Hudson City (Hero Games) - HERO
Iron Kingdoms World Guide: Full Metal Fantasy Vol 2 (Privateer Press) - d20 fantasy
Valus (Different World Publication) - d20 fantasy
X-Crawl Color Edition (PandaHead Productions) - d20 fantasy
Honorable mention: Valdorian Age (Hero Games) - Hero
Best Supplement
Advanced Gamemasters Guide (Green Ronin Publishing) - d20 fantasy
Beyond Countless Doorways (Malhavoc Press) - d20 fantasy
Dark Champions (Hero Games) - Hero
Temple Quarter: A City Quarters Sourcebook (The Game Mechanics) - d20 fantasy
Vampire: the Requiem (White Wolf Publishing) - new WoD storyteller
Honorable mention: Werewolf: the Forsaken (White Wolf Publishing) - new WoD storyteller
Best Aid or Accessory
Area of Effect Packages (Steel Sqwire) - no system (but size for d20 size grid)
Battlebox: Core Fantasy Set (Fiery Dragon Productions) - d20 fantasy
Conan Pocket Edition (Mongoose Publishing) - OGL based on d20?
Dungeon Magazine (Paizo Publishing) - D&D
Future Tiles: Starships (Fiery Dragon Productions) - no system?
Honorable mention: Vampire: the Requiem Storytellers Screen (White Wolf Publishing) - new WoD storyteller
Best Free Product or Web Enhancement
Danse de La Mort parts1-8 (White Wolf Publishing) - new WoD storyteller
Dungeon magazine map and handouts (114-122) (Paizo Publishing) - D&D
Fort Griffin Echo Vol 1, number 1 (Dog House Rules) - Sidewinder / d20 modern ?
Harphq.com (Iron Crown Enterprises) - HARP
A Magical Society: Guide to Monster Statistics (Expeditious Retreat Press) - d20 fantasy
Honorable mention: Necromancer Games web page - d20 fantasy
Best Electronic Product
Sponsored by DriveThruRPG.com
Buy the Numbers (ST Cooley Publishing) - d20 fantasy
Counter Collection Digital (Fiery Dragon Productions) - d20 fantasy ?
Danse de La Mort parts1-8 (White Wolf Publishing) - new WoD storyteller
Frontier town Ft Griffin (Dog House Rules) - Sidewinder / d20 modern
PCGen 5.8.0 (PCGen) - d20 fantasy / d20 modern
Honorable mention: Campaign Suite Extended (Twin Rose Software) - d20 fantasy / d20 modern
Best Game
Ars Magica 5th Edition (Atlas Games) - Ars Magica
Capes (Muse of Fire Studio) - Capes
Fireborn Players Handbook (Fantasy Flight Games) - Fireborn
Warhammer Fantasy Roleplaying (Black Industries) - WFRP 2.0
World of Darkness Rulebook (White Wolf Publishing) - new WoD storyteller
Honorable mention: Burning Wheel (Burning Wheel) - Burning Wheel
Best d20 Game
Blue Rose (Green Ronin Publishing) - OGL based on d20
Castles & Crusades (Troll Lord Games) - OGL based on d20
Dawning Star: Operation Quick Launch (Blue Devil Games) - d20 modern/future
Monte Cook's Arcana Evolved (Malhavoc Press) - OGL based on d20
X-Crawl Color Edition (PandaHead Productions) - d20 fantasy
Honorable mention: Masque of the Red Death (White Wolf) - Licenced d20/D&D