Somebody observed (around here or reddit?) recently that there are no unemployed mathematicians. By that, s/he probably meant statistics/probability, linear algebra and diff EQ's as good things to be good at:

http://measuringmeasures.com/blog/2010/3/12/learning-about-m...

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FP, there's pretty strong interest in erlang, ocaml, haskell, F#, scala , clojure. Also scheme/CL .

http://stackoverflow.com/questions/805429/learning-scala-or-...

http://www.slideshare.net/brweber2/functional-concepts-for-o...

http://enfranchisedmind.com/blog/posts/what-killed-lisp-coul...

http://ivory.idyll.org/blog/jun-10/functional-programming-la...