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Hello Friends, I recently asked something in a different forum and I got a negative response. I came across this thread today, and I see you are stating something very interesting: "The Mac must be "on" but may be asleep for them to work. Equivalent PC options exist but you're on your own finding them." I'm currently looking at purchasing an AirPrint compatible printer, and a Mac mini. I specifically asked whether I could expect printopia to work while the mini was asleep, and, as I said, I was told that didn't work. For that reason, I decided I should go ahead and restrict my search to real AirPrint compatible printers, but your statement makes me reconsider that. As of iOS version 4.2, native printing capability is part of iPad's bag of tricks. This capability requires a wireless-enabled printer, and the only control you have over your printing is to set the number of copies to be printed. You can print photos, e-mail messages, and websites, and when Apple adds support for printing in Pages or it's added in other apps such as DocsToGo, you'll be able to print documents as well. You'll find that the little button with an arrow on it — which is located in the Safari, Mail, and Photos apps — contains a Print command. When you tap that command, you see the Print dialog. Follow these steps to print: Thanks and Regards, Agili Ron
Here's a link from the same site Jim Lynch referred you too, though this is iPad-specific.
But to answer your question, if your iPad is running iOS 4.2 or later, it comes with AirPrint, which allows printing via wi-fi with compatible printers. Here's an Apple support page listing all the manufacturers and models that are AirPrint-enabled. There are a lot of them.