I own right around 75 blog domains, most of them were PR3 prior to the June update, something like 70% of them dropped from PR3 with something like 15-25 going from PR3 to PR0, I did a little bit of linkbuilding after the update (not much though) ,and around 3-5 went from pr0 to pr3 on this update, 15 or so went from PR2 back to PR3. Crazy stuff!
**Edit**
I just ran the numbers, Total of 77PR network wide up to PR116 network wide
Only ONE domain dropped in PR , from PR4 to PR2 (It was PR5 prior to the June update) and it was a rather legit green energy blog.