Did you notice that the URL for search on TechNet changed recently?
It is now social.technet.microsoft.com/search.
Check out the new "refinements" (that work like "filters", only, I guess "filters" sounds too prole...) and the "Related To:" listings that bring you "pre-refined" searches, nifty.
Bothered by English-language results being categorized higher on the search results page than non-English results? Check out the new ability to exclude English results.
Follow the Rob Veliz blog for more info.
Watch Chris Slemp's video* for an overview of TN/MSDN's "social platform" that includes: Social Bookmarking