Google Preparing Large Update? Shifts On May 2nd & 7th

I mentioned there was some chatter about a Google update on May 2nd but now we are seeing even more chatter and signs of flux in the Google search results on May 7th.

These signs of shifts in rankings, spikes in crawl rates, often, but not always, are early warning signs of a major Google update happening in the near future.

Here are flux/volatility charts from MozCast, SERPS.com, SearchMetrics and Algoroo:

All show similar patterns for the most part.

The chatter in the forums, including the ongoing WebmasterWorld thread follow these patterns also.