tedster - 10:50 pm on May 23, 2010 (gmt 0) [edited by: tedster at 11:00 pm (utc) on May 23, 2010]
...couldn't this be an indication that the Caffeine rollout is finished?
Maybe not completely finished, but at least being served a large proportion of users. However, this idea about a change in phrase-based indexing is not anything that's confirmed at all - it's just a working hypothesis for me.
[edited by: tedster at 11:00 pm (utc) on May 23, 2010]