I have just released the last version of my Unlocker (Now for Firefox/Chrome/Opera).
It should be a bit more stable now, especially for Opera users.
I also download the Grooveshark(tm) Website now, so we shouldn't get any old website problems in the future.
I want to implement an option that allows you to select the source of the Grooveshark(tm) client.
Download at:
http://www.scilor.com/grooveshark-unlocker.html