Started coding in the mid-80's and went through a plethora of languages, OSes, frameworks, you name it. Learned ML when Caml Light was new and got a third price in logic programming contest between universities.
Nowadays I care mostly about JVM, .NET and first class languages from OS vendors.
Why? Not all of us have the luxury to move around just for working with the languages, or the skilled team, we would like to.
This is primarily why I'm focusing on strengthening my JavaScript skills...There are tons of start-ups looking for back and front-end devs. Your comment also makes me want to get back into Java and C#...I've taken the time to learn Haskell but I know realsitically I'll never get a Haskell job (at least here in Quebec...).
Nowadays I care mostly about JVM, .NET and first class languages from OS vendors.
Why? Not all of us have the luxury to move around just for working with the languages, or the skilled team, we would like to.