Another Slime for Vim
Over at Jonathan's Techno-tales Jonathan Palardy writes about using Vim for Lisp programming. His idea is to emulate some of the Slime functionality by using Gnu Screen to help communicate between the REPL and the Vim editing buffer. He's written a Vim plugin to automate the process but you don't need that to try the process out.
It's a nice hack but doesn't have anywhere near the functionality of Slime. Still, if you're a committed Vim user and program in Lisp this may be a good solution for you. The same technique should work with any language that uses a REPL-like mechanism.