At my work place we have some dry erase boards, but they get in the way of the projection screen which is also used pretty often. I am wondering if the ipad2 can be used as a whiteboard so to speak, with a stylus so that the instructors can write down stuff and not have to move the board out of the way. the main concern is how versatile the apps are for this task, there will be very complicated problems and equation solving involved. Would it be possible to write on a page and open a new page but still have the previous page saved? will it be possible to make annotations to pdf documents? can we look at graphs and write over them?