Diigo: I LOVE Diigo. It's a browser add-on (Firefox and IE) that allows users to highlight text directly on a website, then add a sticky-note for comments, which can be published to a group. This would be an excellent way for students to share/discuss websites as they research. Highlighting text creates an archive on the Diigo site, essentially saving all the information (including a shot of the page) and comments in one place. From there students can add additional comments on all the pages, avoiding doing a WWW treasure hunt.