Padlet is a site that got quite a bit of press a few weeks back. This is the site that was formerly known as Wallwisher and is an ideal "Web 2.0" tool to use in the classroom. Padlet is a great way for creating an interactive board that teachers can use to collaborate w/ students. This is a great way to leave notes, use as a backchannel chat for engaged learning, brainstorming, and much much more. Best of all it is super easy and free to use.
I highly recommend checking out Padlet by clicking here!!!