This is somewhat of an iPhone question, but really has to do with my OS X login. I migrated from a G4 Powerbook to this C2D MBP, and used the migration assistant. Now I think I shouldn't have. I can't sync my iPhone properly, and it just hangs...but when I make a new login, I can. So, my question is, other than making a new login or re-installing OS X and formatting, is there a utility or some guide I can follow to really clean up OS X?