There's a one-off custom Metallica, commissioned by the band. It's a re-theme of Earth Shaker with new art, audio and programming. They also commissioned a game for the Beatniks Car Club along the same lines. I think the the source game for that one was Elvira and the Party Monsters. I played the Metallica game at PPE 2009, but no such luck with Beatniks.

Both were made by Wade Krause, Dirty Donny and Tanio Klyce.

I ran into Wade Krause around a month before PPE and asked him what his latest game was. He said it was called "Spookytown" or something like that.