I registered just to add my request to those above.
I now carry around my codexes (2 days in front of a flatbed scanner... *headache*) and army lists on the iPad - having army builder on it would complete things.
Right now I am using a remote desktop app then beaming into my home pc with army builder on it, but it's far from convenient
I think the iPad is going to be a hit amongst gamers once they've seen somebody using one for their gaming.