Just bought the iPad2.
Using Air Nav Pro and Fore Flight, great for weather and pre flight info. The GPS on both work fine in the air.
AviMap Gps is a good way of getting free sectional chart coverage in the US.
Wundermap & Radar US are also good for weather radars.
Tried EFB (Electronic flight bag) seemed to be working well and better than Fore Flight, XWing and Air Nav Pro. It locked up my iPad, and blocked all Email's. Everything turned to normal after I deleted it. Could be a coincidence.