Scrible is a free service offering a
nice set of tools for highlighting, annotating, and bookmarking
webpages. Scrible offers browser bookmarklets for Firefox, Chrome,
Safari, and Internet Explorer. With the Scrible bookmarklet installed,
anytime you’re on a page just click the bookmarklet to launch a menu of
bookmarking tools. The Scrible tool set includes highlighters, sticky
notes, and font change tools. When you annotate and bookmark a page in
Scrible it is saved as it appeared to you when you were done altering
it.   And as you would expect from a web-based bookmarking tool, you can
share your bookmarked pages with others. Students can get a free Scrible account that has double the storage capacity of the standard free account.

Scrible recently added an options for formatting bibliographies as you bookmark. Scrible also has a new feature that allows you to compile your article clippings into one package. 

Applications for Education
Tools like Scrible are excellent for students to use when they’re conducting online research. The benefit of using a tool like Scrible is that students can take notes on their bookmarks and bookmark only the parts of a website that they need to reference in their reports. Saving bookmarks in this manner saves time when you go back to visit a site because you’ll immediately see what it was that promoted you to bookmark it in the first place.