I saw that Printopia has a download for iOS 4.2.1 devises that works with AirPrint. I downloaded Printopia on my iMac and now I can use the AirPrint on my iPad. "works great"
The download was easy to install and they have a 7 day free trial. If you like it the price of printopia is $10.00.
This is what Apple should had done with the 4.2.1 update.
Google Printopia for the website.
Everyone have a happy Thanksgiving.