I am happy to know other good sites are feeling this pain.. My simple belief is that Google moved me from first page results for a ton of keywords on several sites so they can bring me back later in even higher spots. Seems like this has been way of the past for these things. But to move from number 7 slot on major keyword to 530 has really hurt my ego this time. p.s. Do the folks that experienced this shifting, concur that 72 hours to correct seems about right to them also?
Some of my sites that had been out of the rankings since April are now magically back ranking as usual. Glad to see this happen finally.