One of the things that interests me is ways that we can encourage students to take on a more active role while in class.  Here's a link to a short video posted by a Syracuse University professor showing how he integrates a live Twitter feed into his interactive lectures.  Not only does it permit the students in the room to post comments in real time, but it is available to anyone else who wants to participate outside the classroom as well.  Talk about a way to invite the world into the room!