Kinda language driven. The haskellers, erlang and clojure people are heavily invested in emacs, I use intelliJ for scala, komodo and textmate for ruby/python,

Kinda language driven. The haskellers, erlang and clojure people are heavily invested in emacs, I use intelliJ for scala, komodo and textmate for ruby/python, and I've always used vim on whatever unix boxes i found myself on. (Still waiting for MS to gift me a free copy Visual Studio Ultimate :)