This dataists post of the popularity of programming languages is relavant, though the data may be a but outdated.

http://www.dataists.com/2010/12/ranking-the-popularity-of-pr...

Thankfully, the good folks at Redmonk revisited this analysis recently.

http://redmonk.com/sogrady/2011/09/06/dataists-anguage-ranki...