Is there an iPhone or iPad app that let's you print documents and photos to a wireless printer?

One way or another, yes. Your printer may have an app for that. If not, there are apps that let you print through another computer.

pcmag.com/article2/0,2817,2362451,00.asS... Jobs says direct printing will come:informationweek.com/blog/main/archives.

Sure, you can print it fom your iPhone. I think some model can be send command to print easily like thiswirelessallinoneprinterreviews.com/canon-pi.

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