I'll say it. Diigo is kinda AMAZING. Not only can I bookmark a page, I can create libraries of information and keep myself organized (no small task). Even cooler, things won't disappear!!!! It also makes it possible to communicate thoughts and information, rather than just a link to web page. Highlighting and sticky notes are awesome!!!
With the adoption of Common Core Standards and the work that needs to be done to revise curriculum, this tool would be most valuable. It would allow collaboration to occur outside of physical meetings. Pertinent information can be shared with colleagues and "discussed".