Via Matt Cutts:
http://www.mattcutts.com/blog/google-pagerank-update/
Nice of him to post an advance warning this time 
I don't notice any changes yet but I don't think our toolbar PR's have changed at all in the last year or so.
Megan
My web design blog
Vicerus posted this at 13:12 — 28th July 2008.
They have: 77 posts
Joined: Mar 2008
I have some changes with my web sites and blogs and i think that is true. I think that we need to let google few days to take care of that.
Solommon posted this at 11:17 — 31st July 2008.
They have: 127 posts
Joined: Feb 2007
I have had no changes with my sites guys. So are you sure about PR?