dotstorming is a new site for brainstorming that I just found out about from Richard Byrne's excellent blog. The way this works is a by placing "dots" on a digital canvas acting like a sticky note (i.e. padlet). Once the dot is place, a user can then add text or an image next to it. Finally, other users can then vote on the "dots" or notes that have been placed.
I highly recommend checking out dotstorming by clicking here!!!