If it's an Intel mac, it's very easy. Software like Parallels, or, if you know how, bootcamp. You set set aside a portion of your hard drive as a windows partition. Volia! You got windows, you got GW!
Otheriwise: no. I tried. There isn't anything.
Like I said, I had GW running the other day here at work on one of the new 24" imacs.

Was pretty high class. I'm n mac support, so yes. If your Mac has an intel processor. then yes. It is very possible.