One of my very favorite Mac applications, TextExpander, found its way to the iPhone (iTunes link). This is an indispensable text replacement tool. I was going to write it up in detail but noticed my friend John Chandler already did. One of the most intriguing features is their release of the text expansion engine to other developers. While you can bet money this will never end up in Apple's Mail app, I can easily see twitter and other text heavy apps embracing it. Nice work SmileOnMyMac.