It was very nice to be able to print something from my iPhone last night using AirPrint. I've got a new HP C410a and it worked great. Luckily my old all in one had the scanner die recently so I replaced it with one with ePrint. Good timing!
Funny, I have quite the opposite experience. I have an HP c7250 which the iGrocery app has always been able to see and send coupons to to print, but airprint doesn't even see the printer.