This item from MacCentral boggles the mind:
Microsoft acquires Virtual PC from Connectix
Here are a couple things Microsoft might do:
1. kill the VirtualPC product for the Mac, to lock Mac users out of future versions of this powerful PC emulation engine.
2. recompile the Windows bits as PowerPC native code, potentially hugely accelerating the performance.
If they chose option 2, then who knows, maybe they'd release PowerPC code generators for their compilers, and things could get weird pretty fast.