If you have root, then be careful. If you authorize 10 devices (different ROMs) to your Google Account, then you can’t add any more. It used to be as simple as deauthorizing devices every time you reach you limit. As of now, you can only deauthorize 4 device PER YEAR. Be careful…I just had to reupload all my music to a different account because of this.
XDA Thread about this: http://forum.xda-developers.com/showthread.php?t=1656038