ignatius - 8:11 am on Jan 5, 2012 (gmt 0)
I'm currently going through something different since January 4th.
My entire network of sites (10 sites in 10 different countries/languages, on different TLDs, all with excellent content) dropped at the exact same time.
All keywords are gone to +50, classic Google penalty. Never experienced such a thing before.
But it's not the typical Panda drop, so my issue might not be related to what you guys are experiencing right now, but I figured it was worth mentioning it in case someone else is seeing the same movements.