is a social bookmarking site similar to del.icio.us.
Furl also privately archives a complete copy of each page that a user bookmarks, making it accessible even if the original content is modified or removed, an antidote for link rot. This also allows full text searches to be made within the archive. Topics are used to categorize saved sites, similar to the tagging feature of other social websites. Additionally, a user may write comments, save clippings, assign each bookmark a rating and keywords (which are given greater weight while searching), and have an option of private or public storage for each topic or item archived. From WikipediaSounds like furl takes bookmarking to a higher level. I've been using del.icio.us and find it meets my needs at this time.