Microsoft is publicly vetting future funtionality for the MSDN and TechNet websites at two sandbox websites:
www.trymsdn.com
www.trytechnet.com
Popular features will migrate to the actual websites in the future. You'll notice that search and support are more prominent and that tagged filters are allowed on searches across MSDN/TechNet as well as the Knowledge Base, Codezone sites, and MS blogs.
Explore and enjoy. Microsoft wants to hear your feedback.
-Kevin