Virtually... Not Yours

So with all this virtualization going on, one computer can run multiple
copies of an OS (or multiple OSs), all acting like they own the whole
computer. With only some fancy shim layer keeping them from corrupting
themselves and everything else, what are the implications for
security?  Security is an issue that has been raised more frequently as
computers have become more powerful and the network more pervasive.  I
mean, viruses spread fast enough when the World Wide Web was mostly
single computers with modems dialing up to servers.  In this day of
broadband everywhere and constant connections,  doesn't virtualization
present a special problem?
Doesn't a machine running 10 virtual servers just mean that a virus
gets to invade 10 servers for the price of entering one machine? Let
the SPAM flow!  NOT!

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