The Academy of Interactive Arts and Sciences announced the nominees for their Interactive Achievement Awards this afternoon...here's some categories of note:

Action Game of the Year (pc)
Half-Life, Sierra Studios/Valve
Starsiege Tribes, Sierra Online/Dynamix, Inc.
Tom Clancy's Rainbow Six, Red Storm Entertainment, Inc./Red Storm Entertainment, Inc.
Unreal, GT Interactive Software/Epic Games and Digital Extremes

Action/Strategy Game of the Year (online)
Airwarrior III, Aries Online Games/Kesmai Studios
CyberStrike 2, Simutronics/Simutronics
Starsiege Tribes, Sierra Online/Dynamix, Inc.

Outstanding Achievement in Interactive Design
DMG Pokemon, Team Pokemon, Nintendo of America/Creatures Inc./Game Freak, Inc. (Game Boy)
Half-Life, Team Half-Life, Sierra Studios/Valve
Metal Gear Solid, Hideo Kojima, Konami of America, Inc./ KCEJ (PSX)
Sid Meier's Alpha Centauri, Brian Reynolds, Electronic Arts/Firaxis Games
Zelda: Ocarina of Time, Team Zelda, Nintendo of America/Nintendo Co. Ltd. (N64)

Best of luck to all the nominees! You can take a look at the full list of nominees at the AIAS page, and the winners will be announced on May 13th, during E3.