Google's Ph.D. Advantage

Frisky070802 writes "The New York Times reports on Google's success and desire in hiring Ph.D.'s (free registration required). It says that Google's willingness to let every employee spend 20% of his or her time on an independent project is a compelling motivator and that they estimate that Google has as many Ph.D.'s working for it as Microsoft, which is 30 times larger. How many other companies put "Ph.D. a plus" in their want ads?"