Recently the MSDN and TechNet teams released a social bookmarking preview where members of the technical community can bookmark and tag online resources for their own use and for the benefit of others. You can visit any of the following sites to get started.
Expression for Designers http://expressionbookmarks.com
Along with the launch of the bookmarking service, we have also created a Silverlight app that we call “Ticker”, built using Silverlight 2 beta to consume the feeds of social bookmarks created by the community. The ticker runs through recently added bookmarks and as you hover over a bookmark, the ticker will momentarily pause. This is just one of a family of cool new “community visualizer” applications found at http://www.microsoftcommunities.com.