I did my monthly PR check for 200 sites that I own or watch. Typically they might edge up or down a little. As of April 1 check, the Toolbar PageRank results in Belgium are different than Scotland, which are different than London, are different than southern US, are different than Midwest US.
These aren't tiny changes on a few of the sites. We are talking ranging from 6 to 0 for established sites. None of the 200 sites are even close to stable across the 5 hand checks we did.
I assume then that PR is now "flexible" by DC instead of confirming that myself, I'm just going to be lazy and throw this out there and see if the rest of you see it too.