According to the 2008 Game Development Survey, a new 180-page report from Game Developer Research that questions nearly 2,000 developers from North America and elsewhere (mostly Europe), the PC still rules the development roost. 70 percent of those surveyed said they are making games for the PC/Mac, compared to 43 percent who are making console games, 28 percent who are making games for web platforms and 16 percent who are making portable games (DS, PSP).
Interestingly, on the console front, console developers seem to show a preference for Microsoft's Xbox 360. 73 percent are creating games for 360, 58 percent (including some of the same respondents) for PS3, and 42 percent for the Wii. 15 percent are also still creating games for the PS2.