TextMate Drupal Bundle
Update: new version available.
Jeff Robbins is a TextMate user, like me. He was asking about a Drupal editing bundle for it, when I realized it wouldn't be hard to generate automatically.
So, if you find yourself going to drupaldocs.org often to look up the arguments for a particular function, you'll love this. It generates autocomplete snippets for all of Drupal. Simply type the function name and hit tab to see all the arguments. Each argument is a separate placeholder so you can easily tab from one to the other.
To use it, place it in
~/Library/Application Support/TextMate/Bundles and run it:
php generate.php.txt [path to drupal]
Once you restart TextMate, it should pick up the new bundle.