with Iphone SDK you get an emulator.
if i remember correctly though it requires the source code for apps or something. It comes with a few default apps such as notes and weather.
if you want to play WI on your computer you could try POSE, a palm emulator.
i'm experimenting with this atm.
I have hit a wall in finding an old WI ROM file though.
If you have any luck with this feel free to share
