I find it impossible to believe that the TIOBE indexes are accurate. How could it possibly claim that Objective-C is ranked lower than ABAP, Euphoria and Ch? There's just no way that's true. (Perhaps Objective-C has a peculiar problem about how to disentangle straight C code from Obj-C?)

I could see MOO and Oberon being way down the list, but there has got to be more Mathematica and Maple code being generated at schools and universities than this list could detect. I could pay $1500 to see their dataset, but I'm more curious about where they cull their data from.