Right now I regularly use PHP, perl, and lua. I've been learning Common Lisp and Python for a while, though because my company uses those languages above, and

Right now I regularly use PHP, perl, and lua. I've been learning Common Lisp and Python for a while, though because my company uses those languages above, and because I haven't started any new projects yet for new languages, and because PHP has been my primary language for 5 years now, I think in PHP. I have to broaden my horizons. I've got some fun ideas for projects to tinker with that would use some other languages (recently bought books on Erlang, Haskell, Clojure, and Ruby). And though they likely wouldn't generate much if any revenue, it's worth doing something practical just to learn some new languages. Back when I used to do PHP on my own, and VP ASP for my employer, I was regularly messing up if and loop syntaxes, and <? and <%, and either forgetting or adding semicolons.