3. Makeshift Stand
For a presentation or lecture, I would download Slide Shark. It's the free alternative to KeyNote and has very similar capabilities. It's compatible with Microsoft ppt. and super easy to use. You can also sync your phone to your tablet (if they're both using the same OS) and use it as a remote control from anywhere in the classroom to flip through slides and draw or highlight key points.
You can use the materials listed above to create a makeshift document reader.
You can also display a timer so that students know how much time they have left to complete an activity. It really helps keep them on task.
The possibilities are endless with all the available apps and web based instructional tools out there.