Since it has been mentioned in here a few times, I've become curious about learning functional programming (specifically Lisp or O'Caml). However, my half-hearted attempts so far have not helped ...

I’m interested in learning functional programming and would like to know where I might find low-cost programming tools to experiment with.

Q: I’m interested in learning functional programming and would like to know where I might find low-cost programming tools to experiment with.

I'm trying to learn a little more about functional programming (particularly haskell right now), but it's all a bit confusing for me. Does anyone have any good tutorials for me and/or advice on ...