Sqrl -
http://www.engadget.com/2008/02/20/first-xbox-360-community-games-to-hit-live-immediately/
Games are already hitting Xbox Live Arcade via XNA under Community games. Currently, the games are free demos/betas. But since Microsoft is doing this, it's very logical that the best will become full XNA-made Commercial games. If you use Xbox Live Arcade, under the blade browser, it even states that games are created using XNA exclusively.
Pikazoo -
Although the Wii does indeed have a larger userbase, it does not have a larger online userbase . I apologize for any confusion. Wii online attach ratios are a bit lower than the X360 or PS3.
Xbox 360 - 11,427,000 Users (65% Attach Ratio)
Wii - 9,040,000 Users (40% Attach Ratio)
Playstation 3 - 7,052,500 Users (65% Attach Ratio)
These are via Microsoft, Sony and Nintendo's own admissions on attach ratios, using VGC current Install Base figures. So even though the Wii obviously has 5m+ Wiis sold to consumers, it's still has about 2.5m less users Online, as Wii users have not gone online, as often, as Playstation and Xbox counterparts.
Back from the dead, I'm afraid.
