Considering Adding a Functional Language to My Bag of Tricks

There are a lot of people @Lab who know things like Erlang, Haskell, Python, R, etc., etc., etc.  I’m actually considering learning Lisp, but I need a project.  I “learned” php for a project over the summer, but I didn’t really like it since its so much like classic ASP (really messy).  Maybe I’ll learn F# instead…  That shouldn’t be such a strech since I built an ML compiler in grad school (F# is based on ML).  I wonder what kind of project I’d be interested in would benefit from a functional language…  I suppose I’ll have to read up on the language and maybe that will give me some ideas.

Its funny, doing WPF, my umpteenth technology, is just not enough.