This is why I was excited about getting an iPad. A special connector puts it right up to my projector and I can put any kind of app up there - or the internet, or whatever (though I can put the internet up on the board right through my MacBook).
But here is the nice part. This is an app for writing/drawing. (It reminds me of the Magic Board on Captain Kangaroo when I was a kid and thought it was really, really, cool.) I can sit at my desk, write on the iPad app, and it is displayed right on the board as if I am standing up there writing. Great for keeping an eye on the class; great for days when I don't feel well. And I feel high tech (and cool) for using it!