Now if they'd just support my OfficeJet 7400 Series (the 7410xi, specifically). This was the top of HP's OfficeJet line, and I see no technical reason why it shouldn't work. HP's photo-printing app for the iPhone has worked perfectly with this printer since the earliest days of my old iPhone 3G.
I will keep using this printer until it breaks. I hope that by then AirPrint comes to other printers, specifically Canon.