Javascript decompressors?

Recently we have been debugging lots of Javascript from web pages, and the Javascript is either white-space compressed or obfuscated.

Does anyone know of a tool (preferably for Unix) to turn those ugly Javascript files into human readable form?

Am currently using GNU indent which is designed for C programs, but it does a mildly passable job at deciphering what is going on, but it is not really designed to be a Javascript pretty-printer. I would appreciate any pointers.