Having seen a live feed using this app I was impressed by the way it makes using Facebook as a webinair tool a possibility. You can use one or two cameras which means you can have one camera showing the slides while the other camera can show how to do a task.
This makes running a live presentation a doodle and comments about the presentation can be fed back instantly to the user. It really is a powerful tool on the iPad and something I wanted to write about.
For more details take a look at:-
There is a 14 day free trial. I like the way you can make comments as you do the presentation,