Another iOS feature that Lion has adapted is the annoying implementation of spelling auto-correct throughout the entire OS.  The intensity level is nothing like that found in iOS, granted (see damnyouautocorrect.com) but it’s still enough to irk me.  (At this point I can’t imagine that surprises anyone).

You can either turn this off the boring way by going through System Preferences -> Language & Text -> Text and then untick the ‘Correct spelling automatically checkbox’.

OR fire up the Terminal and run the following:

defaults write NSGlobalDomain NSAutomaticSpellingCorrectionEnabled -bool NO

As usual to turn back on:

defaults write NSGlobalDomain NSAutomaticSpellingCorrectionEnabled -bool YES