每种主要语言和平台的利用率是多少？

I'm interested in knowing how many developers use each of the major languages/platforms, but I haven't been able to find any good recent surveys. If you know of any good data, please provide a link along with a brief synopsis of the survey's methodology (who they surveyed and how etc.) and its conclusions (16% of developers use Java, 12% use RoR etc.).I'm interested in knowing how many developers u