Finally OpenPandora has Last.fmsupport.
This is the main feature added to version 0.5.0. Song submitting can be done automatically or manually. By default in automatic mode, skipped songs are not submitted, but this could be changed in settings.
Settings control was changed and has tabs to reflect additional options.
All links now are opened in default browser and you can't change this behavior from settings.
Some bugs where fixed. If you encounter a bug, please report it via Contact link.