I loved SWTA... Silver Surfer... what's not to like? Mostly I enjoy it when he rocks. I don't really like the slow shit too much. I think my favorite piece he's recorded is the version of Cool #9 (think that's the title) on the G3 video with Eric Johnson and Vai.
I think a great project for Satriani would be to record a CD of Hendrix covers, because he can nail that shit. Or maybe some black metal.