Digg: Digg is all about user powered content. Everything is submitted and voted on by the digg community. Share, discover, bookmark, and promote stuff that's important to you!
: A social bookmarks manager. Using bookmarklets, you can add bookmarks to your list and categorize them
Reddit: Reddit is a source for what's new and popular online. reddit learns what you like as you vote on existing links or submit your own!
StumbleUpon: StumbleUpon uses thumbs up and down ratings to form collaborative opinions on website quality. When you stumble, you will only see pages which friends and like-minded stumblers have liked
Blinklist: Real people with shared interests list the websites they care about. Rate sites you like or save them for later.
Blummy: A free tool for quick access to your favorite web services via your bookmark toolbar, Blummy lets you add and customize widgets that do practically anything: add pictures to Flickr, submit sites to , look up text in WIkipedia. Choose from hundreds of custom "blummlets" or create your own.
Techcrunch: TechCrunch is a blog about Web 2.0 products & companies, many of the posts written by Michael Arrington. The blog's first post was on June 11, 2005
Furl: Make your favorite web bookmarks accessible from anywhere with Furl's lightweight bookmarklet. Furl allows you to easily save, take notes on and share the links you've stored, or browse others' most popular bookmarks to find new and interesting things.
Spurl: Never lose track of a web site again with Spurl's free on-line bookmarking service and search engine. Spurl stores addresses quickly for easy access with a one-click bookmarklet and provides recommendations for new content based on your preferences