Thats not really fair to Groveshark - I have enjoyed searching for artists and listening to a lot of their tracks.
The only issue (but it is a big one) is the complete reliance on flash and the inability to integrate with my pause, forward stop buttons on my keyboard.
The destop app supports media keys, with installation of the appropriate platform specific helpers. :) As far as I know, no sites support media keys directly because browsers don't make them available, even to extensions. If anyone has example sites that can do this we'd love to see them...and figure out how they are doing it. ;)
The only issue (but it is a big one) is the complete reliance on flash and the inability to integrate with my pause, forward stop buttons on my keyboard.