I disagree. The XBox was released by Microsoft, which means that games on XBox use almost the same DirectX libraries that the PC versions of the same games use. That essentially means that there's a Hardware Abstraction Layer there that separates the actual games from the hardware. All the game developers need to focus on (at least at first) is the DirectX libaries and the HAL. THey work on the quirks of each platform later.

As for PS3 and/or Wii games, well, they might require a fair amount more work to convert, depending on their architecture, and the graphics/audio libraries they use...

Actually, I'd wager that a good port takes quite a bit more of an effort to make than most would think. A console-only title is designed and coded with only one or two hardware configurations in mind. In order to put out a decent port, the team has to make sure that the game is compatible and runs decently on a wide range of GPUs and CPUs, plus two different OS's (three if it comes out on mac.) dos4gw82