Maryland attorney Charles Jannace passed along to me an intersting tip that I wanted to share here. If you use DropBox, Amit Agarwal explained on his Digital Inspiration blog that you can configure a DropBox folder on your computer so that whenever a file appears in that folder, the computer prints the file. Thus, on your iPhone, you can simply save a file to a DropBox folder (which a huge number of apps can do) and your computer will instantly print the file. Neat trick.
Next month, Apple will release iOS 4.2, and it will give iPhones (and iPads and iPod touch devices) a built-in ability to print. AppleInsider provides a sneak peak of this function, but note that the AppleInsider article is based on a beta version of iOS 4.2 so this feature could change before the final version is released in a few weeks.