I'm enjoying Clojure - in terms of web frameworks there's Webjure and Enclojure, for example. The latter seems more Rails-ish whereas the former is more Javaesque, but it's still pretty early days. I prefer Clojure to Common Lisp as it doesn't have a lot of the cruft you'll find in CL, it has some cool concurrency features, and you get easy access to any Java library you might want to use. Plus, the source code to the language itself and its supporting libraries is very readable and hackable, which is something I haven't found in other languages.
I can't really recommend web programming with C, although it's a wonderful language to learn; I'm sure you'll have many revelatory moments as you get to grips with it and discover things about the higher level languages that you normally use.
Common Lisp is definitely usable for web development, and Hunchentoot is a pretty decent web server and programming environment, although it's certainly not the only one.