tedster - 2:37 am on Apr 30, 2008 (gmt 0)

A PR update is only an export of data to the toolbar. Any ranking changes due to shifts in PR were already happening -- because the "real" PR values were already being used in Google's calculations. Behind the scenes, Google is updating PR and other link-related factors continually, day-by-day-by-day,

The fact that Google eventually exports a more recnt "snapshot" of that data to the toolbar has no present time effect on ranking.

[edited by: tedster at 3:18 am (utc) on April 30, 2008]