The OSx86 Project has been able to get some Windows software running on an Intel iMac through WINE (WINE Is Not an Emulator), according to a post on the organizationis forum. As an article at Macworld UK notes, WINE doesnit require a copy of Windows to work -- it re-engineers Windows system calls to enable those applications to run in Mac OS X.
However, very few Windows applications run in Mac OS X through WINE right now. When another OSx86 Project forum member asked about games, the response was: "As for games...letis scale it back a bit...kay?"