A new PageRank Update just occurred in the last week of February. IRL got me on this, but I'll still comment it a bit.
First, it's the shortest time observed in between two updates, last Google dance occurred in January
, so it looks like some major change is going one in the way Google deals with update. We cannot conclude right now, this could either mean that PR and Backlinks update will now be made on a shorter time period or that this update was kind of an exceptional adjustment, we should soon know more about this.
Then, about phpBB ...