Not only does BaiBoard allow students to collaborate on a shared whiteboard via their iPads, but they can also jointly annotate PDFs. Much like with AirSketch, BaiBoard also includes the ability to do a web share. This means that when on the same network, and with the unique URL associated with the iPad, ANY device can see a student working on their BaiBoard through a browser.
Though intended for the iPhone, this app could work on an iPad. It allows you to quickly and easily create a story by taking pictures. If you have a 3G enabled device, it also will geotag the camera roll. Could be great for field trips.
"Mobile Learning SIGSIGML is the ISTE special interest group that is an advocate for mobile learning worldwide, and promotes meaningful integration of mobile devices in teaching and learning in formal and informal learning environments." - from SIGML
"The debate over digital learning will soon enter a new phase. No longer will educators debate whether or not digital learning has the capacity to transform the American education system. Just about gone are the anti-technology Luddites who insist that every classroom be self-contained, with students and teachers left to their own devices, save for the help of pencils, chalk, blackboards and weighty textbooks stuffed into 10 kilo backpacks." - from ISTE about the need for the new Mobile Learning Group.