Forbes: Jitters Over Virtualization

Ed Sperling interviews Margaret Lewis, who carries the long-winded titles of "Director of Commercial Solutions and Software Strategy at Advanced Micro Devices." Nevertheless, she makes some fascinating points regarding problems of running software with virtualization (running multiple OSes) and on multi-core CPUs.

Threading doesn't scale, but:

...if you were using virtualization you could go from running 20 virtual machines to 60 virtual machines, each with 60 different OSs [operating systems] and 60 different applications to running 100 virtual machines on a server. You could scale by putting more virtual machines on the server.

The entire interview is worth a read.