A big update since the press release has gone out.
The "launch window" list of Live Arcade titles will be:
Astropop Popcap Games
Bankshot Billiards 2 pixelStorm, Inc
Bejeweled 2 Popcap Games
Crystal Quest Stainless Games
Feeding Frenzy Popcap Games
Gauntlet Midway Home Entertainment
Geometry Wars 2 Bizarre Creations
Hardwood Backgammon Silver Creek Entertainment
Hardwood Hearts Silver Creek Entertainment
Hardwood Spades Silver Creek Entertainment
Hexic® HD Microsoft Game Studios
Hoopworld Streamline Studios
Jewel Quest iWin.com
Joust Midway Home Entertainment
Marble Blast Ultra GarageGames
Mutant Storm Reloaded PomPom Games
Outpost Kaloki Wahoo Studios
Robotron 2084 Midway Home Entertainment
SmashTV Midway Home Entertainment
Wik: Fable of Souls Reflexive Entertainment
Zuma Popcap Games
Publishers who will support Xbox Live Arcade:
Atari
Bizarre Creations
Capcom
Codemasters
CTXM
Digital Eclipse
Electronic Arts
Empire Interactive
Gaia Studios
GameHouse Studios
Garage Games
Gastronaut Studios
Hamster
Harmonix
HipSoft
Hudson Soft
iWin
Konami
Llamasoft
Load, Inc
Mad Doc Software
Majesco
Microsoft Game Studios
Midway Home Entertainment
Mumbo Jumbo (United Developers)
Naked Sky Entertainment
Namco
Oberon Media
Pick Up And Play
pixelStorm, Inc
PlayFirst
PomPom Games
Popcap Games
Q! Entertainment
RealNetworks, Inc
Reflexive Entertainment
Secret Lair Studios
SEGA
Silver Creek Entertainment
SNK Playmore
Stainless Games
Streamline Studios
Tik Games
Ubisoft
uWink
Vivendi Universal Games
Wahoo Studios
Wanako Games
Wild Tangent
Next-Gen is reporting that games will be $5 or $10 each (addressing the biggest complaint for the original Xbox Live Arcade).
(thanks Geek)
According to someone at Evil Avatar:
-All games will support 1080i
-Joust has both updated and classic graphics, and co-op play over Live
-There will be a big push for independent publishers
Pictures of Arcade from E3 (courtesy of AnandTech
The "launch window" list of Live Arcade titles will be:
Astropop Popcap Games
Bankshot Billiards 2 pixelStorm, Inc
Bejeweled 2 Popcap Games
Crystal Quest Stainless Games
Feeding Frenzy Popcap Games
Gauntlet Midway Home Entertainment
Geometry Wars 2 Bizarre Creations
Hardwood Backgammon Silver Creek Entertainment
Hardwood Hearts Silver Creek Entertainment
Hardwood Spades Silver Creek Entertainment
Hexic® HD Microsoft Game Studios
Hoopworld Streamline Studios
Jewel Quest iWin.com
Joust Midway Home Entertainment
Marble Blast Ultra GarageGames
Mutant Storm Reloaded PomPom Games
Outpost Kaloki Wahoo Studios
Robotron 2084 Midway Home Entertainment
SmashTV Midway Home Entertainment
Wik: Fable of Souls Reflexive Entertainment
Zuma Popcap Games
Publishers who will support Xbox Live Arcade:
Atari
Bizarre Creations
Capcom
Codemasters
CTXM
Digital Eclipse
Electronic Arts
Empire Interactive
Gaia Studios
GameHouse Studios
Garage Games
Gastronaut Studios
Hamster
Harmonix
HipSoft
Hudson Soft
iWin
Konami
Llamasoft
Load, Inc
Mad Doc Software
Majesco
Microsoft Game Studios
Midway Home Entertainment
Mumbo Jumbo (United Developers)
Naked Sky Entertainment
Namco
Oberon Media
Pick Up And Play
pixelStorm, Inc
PlayFirst
PomPom Games
Popcap Games
Q! Entertainment
RealNetworks, Inc
Reflexive Entertainment
Secret Lair Studios
SEGA
Silver Creek Entertainment
SNK Playmore
Stainless Games
Streamline Studios
Tik Games
Ubisoft
uWink
Vivendi Universal Games
Wahoo Studios
Wanako Games
Wild Tangent
Next-Gen is reporting that games will be $5 or $10 each (addressing the biggest complaint for the original Xbox Live Arcade).
(thanks Geek)
According to someone at Evil Avatar:
-All games will support 1080i
-Joust has both updated and classic graphics, and co-op play over Live
-There will be a big push for independent publishers
Pictures of Arcade from E3 (courtesy of AnandTech

