If I remember right, at least a year ago when I first got my Nexus One, Grooveshark was also hidden on Android Market if I had an AT&T SIM in my phone. I could

If I remember right, at least a year ago when I first got my Nexus One, Grooveshark was also hidden on Android Market if I had an AT&T SIM in my phone. I could only see it and download it if I pulled my SIM out and connected via wifi. Otherwise, searching for it turned up nothing. This was when I discovered that there are carrier specific blacklist on the Market -- PDANet was a similarly blocked app, presumably on AT&T's request.