VPC doesn't do games or any 3D since the emulated graphics board is very sub par, now there is speculation on the fact that there isn't a G5 version of it, that it may actually run windows better on the G5 than on your average x86 box, but thats another topic.
You can try any blizzard game, they're all cross platform on the same disk. THe biggest Game maker/porter on the Mac side is
MacPlay, you can find tons of game trailers at
Apple's Quicktime Game Trailers, a great game review site is
MacGamer, my favorite Gaming store for Mac and PS2 games is
GoGamer and then theres the multitude of free and cheap games at
VersionTracker/Games. If you need any more check your your favorite big game companies like aspyr or 3DO for their latest stuff.
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