Please, please, stop with this TIOBE nonsense. This index is a joke - can't someone with a burning desire for a weekend project create an open-sourced index website and engage with other hackers to incrementally improve it?
LangPop.com is a lot better than TIOBE, but I'm not sure about open sourcing it... I'd kind of like to sell it for a bit of money and get out of running it (which I haven't actually been doing much of lately).
The one thing I can't stand about TIOBE is not the index itself - it is what it is - but the breathless announcements about so and so overtaking this or that, like it's a horse race.