iPad 2 as a Document Camera
Don' t have a document camera, but have an iPad2. Well then you have a document camera.
Buy an adjustable iPad mount like this or find some tools around school to hold your iPad2 and use it as a document camera
Use the app BOARD CAM it allows you to draw, use pointers and stick labels over the video image. You can also record a video of whatever you do in the screen. The app has been out for a while and has evolved including other presentation tools. Currently it also allows you to do the things described above over an image selected from the device's photo album.