I have wrote a Rhythmbox plugin for playing mp3 streams from goear.com. It searchs, requests several pages on demand, fill the metadata when the stream begins and sorts the search results.
What is missing is the capability to make playlists with selected streams.
You can find the patch in Rhythmbox’s bugzilla. Just patch the code, add the goear.png in the puglins/goear directory, build et voila. The patch was done with the current subversion HEAD, but also is applied cleanly in the Hardy Ubuntu’s source package.
By the way, you can find a Hardy Ubuntu package for 32bits with the patch here (the metadata filling doesn’t work here )