According to http://www.macworld.co.uk/news/main_news.cfm?NewsID=6829 a new x86 emulator has been made for the Mac that will run on G5s. It is basically a modified and enhanced version of the open source emulator Bochs. It is not as fast as VPC6 on a G4, but at least it provides the option for G5 users to run windows programs on their Macs. The program costs around $30.