I remember the first time I saw Virtual PC for the Mac - probably 10 years ago. An Apple rep came to the Board Office, plugged his Mac into our network and ran several Microsoft Office applications simultaneously and snappily. He even found one of our network printers and fired off a document to it. All this in a rabidly Windows environment. Magic!
I wonder whether it would be safer to surf the web with the virtual copy of Windows, avoiding any viruses or nasties that way.