I have full Ordnance Survey, CAA 1:250k and CAA 1:500k of the UK on my iPad. I view using the Memory Map App with GPS showing current position. I bought it to use for planning and quoting but was very pleasantly surprised to find the GPS works very well. From turning it on it takes about 5 seconds to acquire a position and has never dropped out.
Jeppesen have just released an app allowing you to view your approach charts or you can view PDFs of AIPs as mentioned in an earlier post.
It runs spreadsheets, word etc so you can get on with work.....
Get the aeroweather, notam and theseusGrid apps.....
When you land you can read books, the newspaper or watch a film. Surf the net, write emails, post on PPRuNe.....!
The battery really does last 10 hours. I am yet to run out of battery in a normal days flying, sitting around.
In short it is a fantastic bit of kit! After a week you won't leave home without it.
Bilbo
PS I fly corporate 109s and have a 3G Ipad with 64 GB of memory