Google has just launched a great new search tool - Google codesearch searches over public sourcecode.

I decided to have some (very unscientific) fun by searching for the names of the Design Patterns from the GoF book to see which are the most popular. And the results are in - the winner (rather unsurprisingly) is the State pattern!. NB Singleton (my Surname) is about halfway down. Click on the graph to see the detailed results!