Now, they released their latest update w/ Go Interactive, this basically turns your iPad into a "clicker system". It allows students to answer any question the teacher asks, and they use their iPad to respond, either tap on Y/N, T/F, thumbs up/down, fill in the blank, or draw their answer.
I love the whole drawing/typing feature. A student can who is afraid to ask a question out loud can now type it and the teacher gets it. A teacher can track which student responds w/ which response, etc etc. Also, the draw feature is great for those questions regarding Math/plotting on a graph, spelling, tracing letters, Geography, etc etc.