Google's recent Jagger update has caused a lot of trouble for many webmasters. Although Google tried to eliminate spam pages from its search results, many spam-free web sites have also been hit by this ranking algorithm update.
During Google's update, MSN.com temporarily had a PageRank of 2. Even the spam-free blogs of some Google employees were removed from Google's index (they have been restored in the meantime).
It's obvious that Google had some problems with this ranking algorithm update and that not everything went the way it should.