I recently became aware of this online discussion that was started on the Apple Discussion boards.
It seems there is also a ning group started for educators using or exploring the use of the iPad in schools. From the discussion board:
There are two nings here addressing some of the questions you asked: one is part of a general ed tech discussion (http://isenet.ning.com/forum/topics/ipads-in-education) and one is more focused on the specifics of ipads (http://ipadeducators.ning.com/). Neither are terribly active (former has more going on than the latter) but you may find some answers on there, or at least get discussions going.
Here’s another discussion forum I discovered. It’s located in Australia – but the conversation is relavent no matter where you are: