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Popplet is a new web app that is like Wallwisher on steroids. You can make an online "bulletin-board" with virtual "post-its" (called "popplets), just like in Wallwisher. And, except for the fact you have to register to use it, Popplet is just as easy and, in some ways, easier to use with a lot more functionality. With Popplet, you search for images and videos on the Web directly within the "popplet" instead of copying and pasting the url address (as you need to do in Wallwisher). You can draw within the "popplet" and it doesn't appear to have an limit on the number of characters you can use. You can connect the "popplets." You can also embed the whole thing.

Definitely looking further into this one!

another mindmapping tool, looks quite nice.

Nice video tutorial