gSpell is a service for Mac OS X that provides spelling suggestions from Google. For some words and phrases Google's spell checker is much more accurate than a desktop spell checker (since their sites generate insane amounts of statistical data regarding the world's most common spelling mistakes [searches] and their intended spellings [results clicked]). Their spell checker also corrects formal names (can your spell checker fix Rachmananoph, Seve Jobz, or Afex Twen?) and colloquialisms not yet included in desktop spell checkers.