I just received my invitation to join Mural.ly, and am very impressed. I’d strongly encourage you to register for one. It lets you drag and drop images and links (and the links appear as thumbnail images on the screen);it lets you write on it or add speech bubbles — it’s basically a super-duper-duper Wallwisher (or other similar sites you can find at The Best Online Virtual “Corkboards” (or “Bulletin Boards”) ).
For right now, I’m adding it to that list because I can’t think of a better one.
Here’s a video on the Mural.ly. I used to have it embedded in the blog here, but it comes on automatically with an annoying tune, so I took it out.