Now to start you have to know there is no such thing as an iPad lesson, I just needed a title. In fact this is just an idea of what a lesson might look like if you had iPads available.

Students enter the room having looked at the video posted on Edmodo the day before. The video is a starter of sorts to get the students engaged in the lesson. The students come full of questions and ideas to share.
On the board is the objective set out on switch incorporating pictures as well as text to look interesting and inviting. Underneath one word, Discuss!
The students sit down and start talking about the video, what did they think? What questions might they have? Meanwhile I walk around doing the register and listening to the conversation.
Discussion now starts as a whole group. Explain everything being used to capture the conversation and to write down ideas. This can then be shared later.
Students now get out their iPads, they use Evernote to make some notes. (Those with poor literacy can voice record their notes.)
iPads to the side and we look at taking what we have explored and making sense of it. We work in groups to explore different areas. 4 groups in total with a job of reporting back at the end, sharing their findings.
iPads back out, 1 for research, 1 for compiling notes (shared via Evernote with rest of group). All students engage in discussion.
Teacher is monitoring groups at work, documenting what is happening with photos, (this will be made into a comic strip on comic life for future revision)
Feedback happens, students stand and deliver their findings as a group, possibly having created a presentation but not essential, this is developing their oral literacy and confidence in front if others.
All students make notes on the presentations on their chosen style.
Now the fun part, what have they learnt?piecing all the research together each student needs to create something to show it.
This is where the iPad comes into its own. Choice. Could be a video, puppet pals, website, written piece if work, augmented reality, blog, podcast, drawing, the list is endless.
Finally all the work is completed, the teacher has moved around continuing to document the students at work, helping where needed (though students that were struggling used Edmodo to post a question for others in class to answer, stole this from Jenn Ludgates FAQ wall idea)
Back to Edmodo to check understanding, simple quiz to check understanding, using colours to see where students are.

Granted I am not saying this is an example of an outstanding lesson, but hopefully it shows the possibilities, you may never do the full session and in fact it is possibly too much. The device should be used to enhance what is done, to speed things up to maintain pace and to do things that interest the students and give them a personal choice.