I think Google Notebook was the best all around research bookmarking tool-thing on the web, but Google recently stopped supporting it. I'm not sure why they did this but I think they want me to install the google toolbar instead. I tried that out and it just taxes my whole setup here too much, I don't like it. Notebook was better.
What was especially awesome about Notebook was the way that I could gather and organize images and photos... conveniently remembering the URLs for me. Letting me share that visual info with other people on the same project collaboratively. It was a great tool for visual professionals... sigh.