Once I started using Mac I never actually had any issues finding and adapting to new applications. I turned my back to windows and never retreat it. But some of you might want to use some windows program and this application will help you.
Darwine: PowerPC – Mac OS X 10.3.9 Panther or later.
Darwine project intends to port and develop WINE as well as other supporting tools that will allow Darwin and Mac OS X/ppc users to run Windows Applications, and to provide a Win32 API compatibility at application source code level.