I always find the TIOBE Index fascinating, but mainly because I just don't get it! I have no idea how any index can rank Transact-SQL (not even just 'sql') over JavaScript.

I'm not sure where the index pulls in its data, but if its putting a specific branch of SQL ahead of JavaScript, I've got to say I disagree.

It does, however, provide a really interesting comparison to the GitHub version of the popularity contest. This article shows quite a different picture: http://adambard.com/blog/top-github-languages-2014/ (albeit a month or two stale now)

The most surprising thing I see from both these lists, however, is that even though we've had decades of programming-language progress, straight-up C still has a hugely strong showing. Sometimes simple is still the best, I guess!