Just released version 0.6.3.
Many new features:
Stations can be changed from tray icon.
Lyrics can be displayed in external browser window. This feature is located in the tools menu.
OpenPandora can be set to stay on top of other windows.
There are also some usability updates:
Proxy support as set in Internet Explorer.
Some users (basically some of the programmers) were receiving debugger messages, but not with this version.
And a more reliable song submition to Last.fm.
Update: On the first run it will say that this is a beta version
Update2: Fixed the installer, so no "beta" on the first run