Enhance your spelling with gSpell
A damn cool spell checking enhancer for Mac users. gSpell checks your text fields for spelling errors using its enormous database of mis-spelled words.
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.
gSpell is a Mac OS X service that bridges the convenience of the spell checking engine which powers all of the Google applications with your local Mac OS X desktop.

Sounds pretty scary to me; another way for Google to keep track of YOU! Damn, they’re going to be spell checking i.e. reading everything you write…