Show me allows you to draw on the screen and record your voice at the same time. It also has the ability take a photo that you have taken or have saved and can draw over it. I have used this in my class to describe how the rain shadow effect works, and other geography related topics. Not only can you save your own videos and show them to your students, you can share your videos with others on the show me website. Show Me is basically an on demand learning service. I recommend the show me app for all teachers who have an iPad this will help you give your students a better visual of the topics you have discussed. With show me it is a great tool that you can use to educate your students or other people around the world with just your iPad.
Here is a basic video on how it works.

Today we have started out projects for the semester exam. Instead of testing the students with a formal assessment I thought it would be fun for the kids to research a country and instead of reporting on it, I decided they were going to make a commercial for it. Since most of my students do not have access to a video camera I will let them use a power point or make a brochure instead. Although some of my students are really excited about creating a video. Some have asked me about making a video over war torn Iraq and having a faux battle scene. I too am excited for them. Hopefully if they are willing I might put some on youtube for everyone to see. I will keep everyone posted.

http://video.msnbc.msn.com/nightly-news/45498776/