Brett Terpstra is the man when it comes to TextExpander — he is certainly at guru level bordering on achieving Buddha zen with the tool. He has shared a bunch of his snippets for us to add to our TextExpander libraries. Here is how you add them.
And don’t forget you can add the pre-defined snippets as well. I love the pre-defined “Accented Words” (which accents characters for you, without you having to remember how to do this) and the “Internet Productivity” one that allows you to shorten a link with bit.ly.