Open Pandora

Program: Open Pandora

License: Open Source/GNU

Description: Quote from the site:
OpenPandora is an open source windows desktop application that exposes Pandora music discovery service

Website: http://openpandora.googlepages.com/home

Other: This is a great little program for using Pandora without having to open a browser. I've found that it creates temp files and doesn't delete them. Doing this would make it truly portable.