Borik - 1:26 am on Jan 28, 2011 (gmt 0)
Same think happened to my site!
Traffic picked up in begging of January and on January 26, mid day it just
dropped to to almost noting...
I think google tried something in January didn't like the way it worked out
and rolled back changes... unfortunately for me and others who saw the gain in traffic...
What is curies why those changes impacted negatively people who didn't get the benefits in the first place...