Of course, once again, I throw in my obligatory "does it work on extenders?" question.
Although even if it does, I'm such a last.fm fiend that I'll probably install this and hardly ever end up using it.
One feature request I could think of, in the spirit of Media Center (although I'm not sure of any legal ramifications) would be the ability to timeshift radio. Have the ability to schedule recordings of certain programs, since the app does have program listings. Having this ability would more than easily make this a must have for everyone!
You mean like RedButton? http://radiotime.com/downloadcenter.aspx