C/C++ (and Python) as far as I'm concerned. Unfortunately, marketing it that way isn't so PC anymore ;) But hell, that's what drew me.
C/C++ for me too, but that was to a large extent due to D1's simplicity (easy to learn, readable source code compared to C/C++).
Except D2's already surpassed D1 :)
That's true, although D1 had a more active library producing community?