TextExpander by Smile is an essential tool for folks who type as often as we do. It lets you create short key combinations that trigger -- and are replaced by -- larger strings of text. For example, I have TextExpander covert "actk" to "Apple CEO Tim Cook." It saves time.
Macworld editor Dan Miller has made a video demonstrating his top five TextExpander snippets. I always appreciate the chance to peer over the virtual shoulder of someone who knows how to use a tool really well. Dan's video is a great example of that. Go and learn something new!