We have been told that as some of the third party apps are updated for 'multi-tasking', they will be able to utilize AirPrint as well. The Apps that are currently supported by AirPrint are Apple's Mail, Safari and Photo app, as well as iWork apps, Pages, Numbers and Keynote. One of the highly anticipated new features is 'AirPrint' which works over WiFi. Recently Apple shipped iOS 4.2 for the iPhone, iPod Touch and iPad. System requirements: 10.5 and higher, Intel and PPC Macs.
Printopia for Mac - $9.95 - Demo available.