Only option at the moment is Virtual PC. One option that might come later on is called Feidian, however their Mac version is still under development. Check this site regularly Feidian
I watch PPLive via VPC, which works fine on a G5, however am getting more and more frustrated about having to run anything via VPC, so I'll check Feidian out, when it comes out. If it doesn't work, I might look at reverse engineer PPLive, and make a Mac version, however there is time constraints, i.e. my time, and legal implications, i.e. the synacast streaming technology is owned by a chinese company etc.
But if Feidian doesn't work out, this might be the way out, and I'll then contact Synacast.