PS3 Worldwide: 400 (US-110, EU-140, JP-150)
360 Worldwide: 350 (US-200, EU-110, JP-40)
Total WW: 750,000 first week combined. Might be a little high--prolly more like 600,000-700,000.
I think the ps3 will manage a slight lead because of Japan and Europe. It will sell more on the 360 in the US, but it will have a higher attach rate (% of owners) on the ps3 in the US.
Well, I now only have access to a PS3 & 360...Plan on buying a wii soon (lol, if I can ever find one available!) but will probably wait until some of the major RPG's come out like Dragon Quest & Tales, etc.
Anyhow, I'm so far behind in games to play that I'm not in a huge hurry (lol, haven't even gotten a chance to finish God of War II yet!)