Just discovered this; it's nice to have things like C-w (delete last word) in all (Cocoa) apps, as well as the ability to jump between words without using option+an arrow key. There's even marks, although they aren't as useful as in vim or emacs as the text field doesn't seem to automatically scroll back up...<p>Here's my DefaultKeyBinding.dict (it goes in ~/Library/KeyBindings):
<a href="http://sporkage.com/DefaultKeyBinding.dict" rel="nofollow">http://sporkage.com/DefaultKeyBinding.dict</a>