Is there any player/plugin/hack that works on Ubuntu and would scrobble "now playing" info from shoutcast radio station ID3 tags to last.fm?
When I needed to perform similar operations in Windows some time ago I used Winamp with StreamRipper plugin. I think there should be some similar programs for Linux available.
The methodology requires some program to rip (and tag) the shoutcast stream and append the tracks to music player's que from where they get scrobbled as ordinary pieces.
Songbird can probably do that, I'm not 100% sure, but it scobbles and can play shoutcast radio (both of these via an addon) Its not sure this will work, but its worth a shot. there are songbird .debs out there, a quick google search will find them.