Livebinders: A great tool for sharing bunches of web sites. Create a binder for a topic and each site you add will appear on it’s own tab in the binder for easy browsing. Handy for gathering sites for presentations or for sharing with classes.

Binders can have subtabs to help organize lots of content. Uploaded files and graphics can also be included, giving this a bit of a wiki feel to it. Use the browser bookmarklet to add sites on the fly.