Does anybody know of anywhere where one might discover the relative levels of use of different enterprise platforms? eg. percentage of J2EE vs. Spring vs. .NET vs. the various other (sometimes more obscure) platforms.
I have seen lots of comparisons of Java vs. C# and so on, but I am not interested in the Desktop or Web side, I am talking about mid-to-large line-of-business server-side stuff. Like trading systems on Wall Street, maintenance systems at airlines, etc.