I am currently using airwx for a quick look at the weather.
I am also trying out a couple moving map apps.
I am looking at an Android tablet instead of the iPad since I have an Android phone and can share the apps between the two.
The Naviator app looks promising. I have been in touch with WingX and they tell me that their moving map will be available for Android before the end of the year.
Navzilla beta also looks interesting.
Aviation Maps is another moving map app, I have loaded it but can't test without a purchase.
just a note (beware of the iPad 2 WIFI model, it has no GPS).
Always looking and hoping our Adnroid apps catch up to and exceed iPhone apps since they are selling a ton of Android phones.