Pay close attention to the final few slides, they seem to outline a proposal for a set of changes that I think can be best described as "add strict variants of the various parallel/concurrent computing primitives haskell has to python (plus side effects tracking) so we can have python be natively good for HPC applications in the future"
Konrad Hinsen is one of the main Clojure hackers. I wonder how he splits his affections between the two languages.
I don't think I am among the "main" ones, but to answer your question: Python is what I use for doing research, Clojure is what I look at because there are lots of good ideas in it. BTW, I also follow some Haskell developments, in particular DPH.
and its also worth noting that scribd links are now html5! (yay!)