AirPrint, but at the last minute it left out the Mac printer-sharing functionalities that were supposedly going to arrive with Mac OS X 10.6.5. That means as of right now the only way to do AirPrint with the yet-to-be-released iOS 4.2 is to buy one of those fancy new HP printers with the AirPrint-compatible ePrint functionality. We're guessing Apple is just giving this feature a little more time in the oven, but if you're just too passionate about printing things to wait, the FingerPrint application from Collobos might fill the void. The $8 app shares just about any printer that your Mac can find over Bonjour and... well, that's about it. Some printers work, some don't, and there's a trial period to find out if it'll work with your particular setup. Too rich for your blood? There's always the hack.