I was on the halflife2.net forums and I came across an interesting thread. Someone ported Half Life 2 to the Duke Nukem Engine. What I am thinking is maybe someone could get that port and then port the port to ppc (lol). Here are some pics:
Here is the thread:
http://www.halflife2.net/forums/showthread.php?t=67537 (need to be signed in to see pics)
MAKE IT HAPPEN!