Concerning the iPad (as a potential teacher device)
According to the English spec page on Apple's website
http://www.apple.com/ipad/specs/I can see no way to export out to a monitor (to either use audio or visual data in the classroom).
And there is no way to actually connect to my internet at home unless I set up a wifi system (I presently use LAN cabling direct from my modem to all my home computers).
Is that correct?