I'm very excited for iOS 4.2 to launch, as AirPrint will be a great service. I'm wondering if anyone knows how it works, and can tell me which printers and protocols will be compatible. While AirPort Express compatibility is a given, how about wireless printers that are already on the market? I have a Brother HL-5370DW which hooks up wirelessly to my router. Any idea if that will work? And has Apple announced if it'll be compatible with the iPhone and iPod touch? Will this become a widely implemented protocol that makes wireless printing from the Mac easier to set up and do in general? Thanks for sharing your thoughts!