I’ve just found this excellent resource for popular OS X text editor, “TextMate”.

If you’re a developer on OS X and haven’t heard about TextMate, you need to step up. TextMate is made by a former Unix geek-turned-OS X geek, passionate about creating a powerful text/source editor.

Created by a closet UNIX geek who was lured to the Mac platform by its ease of use and elegance, TextMate has been referred to as the culmination of Emacs and OS X and has resulted in countless requests for both a Windows and Linux port, but TextMate remains exclusive for the Mac, and that is how we like it!

TextMate is not an IDE but by using its powerful snippets, macros, and unique scoping system, it can often provide features that even a language specific IDE lacks. It has enough project management features to keep most users happy, but is otherwise kept lightweight with a clean and minimalistic GUI.

And indeed is it powerful, with the help of this helpful PDF cheatsheet, provided by g-design.net