The more games of my collection of 110 the better! My faves;
GTA 1-3 (even Cider, they're old so emulation won't harm them)
Audiosurf (given my music library is on OSX I'd get access to ALL my music!)
Beyond Good and Evil
Morrowind, Oblivion and Fallout 3
Lucas Arts point and click games - Loom, The Dig, Indiana Jones'
GRID and Fuel
any game that runs on OpenGL needs to be ported IMO.
There is no reason to not to. Since Mac's run on intel CPU's and OpenGL works on both windows and Mac, there is really no reason not to make a Mac port.
It should be effortless.