It is not difficult to build a database-based webapp using Common Lisp. Hunchentoot, CLSQL and something to generate HTML (CL-WHO and HTML Template are both good).

Clojure is really interesting, and may be my new favorite language. Parallelism is one of those things in programming that is rarely trivial in most languages. Clojure makes a lot of parallel problems easy and it has access to all of Java's libraries.