WikiTalk is another social bookmarking site that is making headlines all over the place. Unlike many other social bookmarking sites it is much more interactive which encourages people to get involved in discussions about the topics and more. You can Check out the WikiTalk.com Public Launch at the site mentioned above.
WikiTalk provides some great news submitted by many. It also has an Internet Explorer Plugin that will tell you about any ongoing discussions about any sites you may have stumbled upon. This is a great way to share your opinions and know what others think of the exact same thing.