OK, so it is still an alpha product ... however, Me.dium still is worth a look for their social search that taps into their main product's data. While it is not comprehensive, it could be another tool for monitoring "buzz" on the internet. Basically your search results are influenced by what people are currently browsing/searching on the internet ... if a topic is popular, it will appear higher in the search results. Read more about the release of this engine at:
(Me.dium press release) and search/try the service at:
http://me.dium.com/search. Note that Me.dium also uses Yahoo's BOSS (build your own search service) api for content ... hopefully Yahoo will be able to remain independant of Google so they can continue to provide these tools.