Well when I heard that it was updated I was so happy because it was about time.. I was expecting only about a PR1, but when I went to check it I saw that adminbb.org is now ranked at a PR3. We went straight from PR0 to PR3 in the 6 months that we have been around. Hopefully its the same for you guys with your PR's increasing.
Congrats to XenForo with the PR4!, how has the recent PageRank update affected your forum?
No offence, but who cares about PR Rank, it doesn't guarantee to get you listed at the top of Google search pages above all other sites with a less PR rank than you. So what does it matter? People searching generally visit the sites listed on the first search page, only moving onto other pages if they don't find what they wanted there first.
You can have a page rank of 300 and 700 articles about XenForo listed, but enter the keyword XenForo and this site with a PR4 will get listed above yours every day of the week.
I was at 2 a while ago but I switched severs and set up a .info version on the old server... IE my content was duplicated and so I believe that's why i lost my PR. I've yet to fix it but tbh unless I'm selling links PR doesn't mean poo poo to me anymore.