Gorgwatcher - 5:36 am on May 6, 2010 (gmt 0)
I think its quite evident now by the recent huge crawl activity in the lesser time that Google has updated its file system i.e. Caffeine.
I guess every one of us has now confirmed an extraordinary crawl rate (and some also confirms the "less time" point).
The "two datasets" observation is nowhere to be found now, atleast for us all the data centers are now showing less or more same results except some normal fluctuation on 8 9 and 10 spots. I think it was due to the implementing the caffeine file system on data centers
Obviously Caffeine will (and it is) effect rankings and SERP in one way or other but the horse mouth definition of Caffeine update can be verified by this single factor of more crawl in less time and the change index size numbers. Lets refresh the original caffeine definition by official google webmaster central blog
"a next-generation architecture for Google's web search. It's the first step in a process that will let us push the envelope on size, indexing speed, accuracy, comprehensiveness and other dimensions"
Some More from the interview matt gave to Mike McDonald of webpronews
"This infrastructure modification will lay the foundation for future indexing changes and will also allow for the expansion of website speed and size. Incidentally, it could even provide a stronger architecture for potential real-time and semantic efforts."
So i think you should not be in doubt anymore about whether caffeine is live or not. :)