Using Prezi as a Whiteboard

In my classroom there is no easy way to both use the chalkboard and the LCD projector at the same time. Although I love chalkboards, today I decided to commit to the projector. I kept a Prezi editing window open, and took notes as I would on a whiteboard. I usually draw pictures and obsessively underline things and couldn't do that as easily here. However, it resulted in a pretty neat document that worked really great for review at the end of the class day. 

You can dive into the Prezi here: http://prezi.com/ja-cumg1hhbd/philosophy-of-mind/

Any suggestions on other classroom whiteboard software that might work better?