Well, HDMI is awesome first off... But I'm a teacher in a fairly wealthy district and we don't have the flat screens in every classroom that steve jobs talks about so I'd only use that feature at home. Now, at work, I connect my MBA to speakers and the projector using a VGA cable. If only I could Airplay into my MBA (I think there's a mac app that allows you to see the mac as an airplay device), and have mirrored output for that (Maybe a pref on the iPad), I could do my annotations of PDFs, sketchbook, keynotes (Hopefully with ink annotations in the future) all wirelessly. It's really cumbersome to have the ipad (or any device) still tethered while teaching. I can only dream I guess...