NewsGator Technologies (my employer) has released version 2.5 of our Social Sites product. You can read the press release or visit the website for more details. Social Sites integrates very tightly with Microsoft Office SharePoint Server 2007, and it uses SQL Server 2005 for its data store. One of the lead developers on the product is Dan Larson, who is a SharePoint MVP and the author of two SharePoint books from Microsoft Press.
I have seen how hard the NGES team worked on this release, and how much testing has gone into the product, so I just wanted to thank them for their efforts.