I am a bio major at UMD and am looking for a note taking app that does the following: 1. Allow me to use a stylus to draw things like chemical structures etc. 2. Record the class 3. Allow me to play the recording of the class and see exactly where I was when the recording was taken 4. Allow for multiple notebooks Does anyone know of apps that do these things? Please let me know! I am on the fence of buying an ipad and this would push me over.