From Adam Haile:
Elpis is native Windows client for the Pandora Radio music service, implemented in C# and WPF. It is a simple desktop application for subscription and free accounts. You can view, sort and select stations, play, and pause, skip song, cover and artist art, and thumbs up, thumbs down, and tired of song options. It saves user credentials and automatic login and automatically plays last station at launch. It features system tray notification with song info, pause on system lock, creating stations, edit QuickMix, and create station from playing Song/Artist.