I must admit that I always thought YouTube shouldn't have a high PR as its not really an authoritative site. Its a very popular entertainment site. So it shouldn't really rank high for many keywords. PR isnt about traffic, its a measure of a sites authoritativeness?
Apparently a lot of sites that link back to you tube lost pagerank, which in effect would make youtube lose pagerank
It is a Unconfirmed PR3 http://www.digpagerank.com/index.php?url=www.youtube.com&dc=18 I dont think it matters if Youtube is PR3 or even if it disappeared from the serps. Probably nerly 100% of its traffic now is type in. Thats the best kind of visitor.
cool... my site is just like youtube i'll have a drink for that. i hope i could have at least half of youtube's visitors in next years.
unfortunately if you're seeing a different PR (higher or lower) in other data centers than the current PR showing in your toolbar that is what your new PR will be once the update is complete, I tell you this from experience.