Virtual PC 6.1 on my 1.25GHz PowerBook G4 runs about as fast as a 400MHz Pentium II. Which is fine for most normal apps, like Office and IE, etc. But add in the fact that it emulates what, an 8MB graphics card? No hardware acceleration anyhow. Current 3D games aren't even worth trying. It's rumured that VPC 7 is supposed to finally take advantage of the graphics card that you have in your system though, but who knows. I'm actually suprised that the PC version of VPC never bothered to take advantage of what your native hardware was... seems like it would've been easier than emulating a PC on a PC. Mac hardware is a different story though.