From NewsGator Technologies:
If you have deployed (or are evaluating) Microsoft SharePoint Server 2007 for your portal services and collaboration environment, youll want to ensure that your teams get the most value from your investment. NewsGator Social Sites makes it easy to create cross-organization collaboration and discussion, improve expertise discovery and internal networking, and energize MOSS with relevant, dynamic content, tagging, tag clouds, pop-up profiles, and more.
Benefits of NewsGator Social Sites 2.0 include: User-created communities with enhanced discussion lists for collaboration and knowledge capture. Expertise discovery and social network visualization capabilities. A more modern, responsive, and engaging experience with lightning-fast pop-up views, tagging, tag clouds, and fresh, relevant content.