iPad users who can't wait until November to start printing documents from the device can get a head start with the new paid Printer Pro app from Readdle.

The developer - maker of other well-known apps such as PDF Expert, Book Reader and Readdle Docs - launched its printing app on Friday, weeks ahead of the iOS 4.2 launch that will bring the AirPrint wireless printing system to the iPad. Like AirPrint, Printer Pro will print a variety of documents directly to Wi-Fi-enabled printers or to printers shared via a Mac or a PC. The new app will enable iPad users to print photos, email, clipboard items and documents hosted by Dropbox, MobileMe iDisk, GoogleDocs and other applications.

Getting a head start on AirPrint will come with a cost, however. While that feature will come free with the iOS 4.2 update, Printer Pro costs $7 to purchase.

The app is compatible with iPads running iOS 3.2 or later.