Funny thing - everything works amazingly, until I turn Flashblock on http://i.imgur.com/HFe8h.png then all my stuff disappears (favs, playlists) and this js error hangs my firefox to death.
Besides that, it's awesome, even better than before.
Chrome sandboxes Flash. If Flash is on your machine but disabled for Firefox, you can preserve the configurations that allowed this, and use Chrome as a dedicated Grooveshark / misc. Flash player. Depending on your arrangement, quitting Chrome can mean quitting Flash, so it can be a pretty elegant solution.
Exelent UX, but the flashblock problem is anoying..
I think they sould put some empty flash animation somewhere on the main page so that you could hit "play" on flashblock.
Besides that, it's awesome, even better than before.