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One more thing...just before this happened (GWT showing no traffic april 6th) I noticed a huge increase in total clicks (50% above normal) for about a week or so before this happened.
Just wanted to put in my 2 cents and not start any rumors. At least from my perspective every time WMT data gets out of it's mind, a ranking shifts happens 5-8 days after.
The last one happened on Panda. On looking at the 3 day old data on Monday everybody was saying WTF, there was a day with 0 data. 4 days later Panda strikes.
The one I remember before that was early November 2010, I had zero data on a day and then 3 days later my SERPS were the best in years.
Not trying to start rumors, just sharing my experience.
So, this thing is continuing to hit mom and pop websites. Google is favoring the giant websites making it very hard for any up and coming sites to survive. Just like the rich get richer, now the big sites will get bigger. It looks like my long tail of keywords is missing. Most of my keyword hits were long tail in the past.