Really well, reviewed in TechCrunch, this is a new, open source social bookmarking tool. Apparently, it allows you to upload and bookmark all kinds of files.

 

Research-oriented social bookmarking site. Some interesting categories for sharing content (articles, lectures, papers), the ability to send private messages and the ability to join groups.

Check this out. Feedburner has added this really cool feature to their feeds, which allows you to email, or tag to delicious, an item directly from your feedreader. From techcrunch.

Web application LibraryThing lets you catalog all the books you own and use tags to organize your collection.
Add book titles by entering a title and viewing search results from the Library of Congress or Amazon. LibraryThing adds the book’s card to your catalog with ISBN, publisher, year and an image of the book cover. You have space to add a book summary, tags, your comments and a review. See what other users also have each book in their library and what they’ve tagged it. LibraryThing is an impressive cataloging app that feels like del.icio.us for books.