I use
simplyscala.com a lot when testing things from this mailing list, or when I just think of how to do something and I'm at work, with no scala distribution installed (I'm not lucky enough to work with scala). However, It relies on scala 2.8.2, which is a bit old when considering the recent refactorings of the API, and the additional stuff from 2.9+. Is there another online REPL out there that uses a more recent version of Scala ?
Alex