Google rolled out another update of their famous algorithm, Panda on Dec 21, 2012. This update is named Panda Update 23 and is said to have impacted around 1.3 % of English queries. Some of the webmasters have experienced an increase in traffic with this update which can be said as a Christmas gift to them. More discussion can be found here:- http://forums.digitalpoint.com/showthread.php?t=2613688
Also See:-
Google Panda Update 22
Google Panda Update 21
Google Panda Update Number 20
Google Panda 3.9.1
New Google Search Quality Updates
EMD Update
Google Penguin Update
Google Human Quality Raters Do Not Influence a Website Rankings Directly
