LayUp is my current side project and, without wanting to blow my own horn, its pretty epic!Its a tool that lets anyone create moodboards, using any image or video you stumble across on the web. Then save you board and send it to all your friends or come back later to edit it.
The vast majority of the functionality is handled on the client side using JQuery. i loved/love working on this project, everyday I'd get home asap to go wrestle with some JSONP!
Check out the video below or Visit LayUp