I am looking for a version of Scheme or even LISP that I can use to recover some lost Lisp development skills. Some web capabilities would be nice but not essential.
I haven't used it myself, but Steel Bank Common Lisp has received some favourable buzz over at reddit. It's open source and free so the price is right for some hobby programming.
In the past, I've had GNU Common Lisp running on my macbook pro.