Has Groovy development (grooveshark client for atv2) been abandoned?
It's still available if u search for packages under nitotv. After installing though, as it hasn't been updated, it's needed to ssh and create a symbolic link for the groovy.frappliance under Lowtide.app (the Lowtide to AppleTV change has taken place since 4.1.1 firmware I guess); btw nitotv and maintenance are located under Lowtide.app with their symbolic links into AppleTV.app.
After installing the package from nitotv and creating a symbolic link through ssh on terminal (ln -s command) Groovy shows up and works! Ok it's buggy, but anyway a great option down here where last.fm is not a practicable choice.
If anyone's interested install the package then ssh into terminal and:
ln -s /private/var/stash/Applications/Lowtide.app/Appliances/Groovy.frappliance
If I'm not mistaken, that's it.