SBCL is a great Common Lisp implementation -- and continues to be improved, with version 1.5.5 just released this weekend. The various web/xml/xpath/database l

SBCL is a great Common Lisp implementation -- and continues to be improved, with version 1.5.5 just released this weekend. The various web/xml/xpath/database libraries for Common Lisp are well supported by SBCL (or vice versa) and make for a great programming experience for web things, in my opinion. McCLIM also continues to improve and is an interesting, if not fully ready-for-prime-time, choice for interactive applications.