InsideMacGames gives their thoughts on Apple's move to x86 Intel processors and has some long reactions of game developers:
Ryan Gordon, Epic Games: From a game development (rather, a game porting) viewpoint, this will be a huge win once we get the majority of users over to these systems, both in terms of developer expertise and end-user performance. Most games we deal with are already running on Windows/x86, and were optimized with the x86 in mind, so "porting" these Mac games is turning off the byte swapping and turning back on the SSE codepaths. Not having to write anymore Altivec code is a GOOD THING for everyone involved. All my bitching about having 30 windows developers and one me are a non-issue in terms of optimization..