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When there is a toolbar PR update lots of things change.  The Search Engine forums discuss these changes and post their findings and theories and the SEO community lookings over all the changes and theorize why the different things have happened.
I keep a list of all the PR 10 Pages and Page Rank 10 Sites on the internet.  This Oct 6th PR update saw 37 out of 152 PR10 pages drop to PR9’s.  This post takes a look at one of the theories why this has happened.

The following are the PR10s that moved to PR9s for each company. Adobe 4/51 pages, Apple 7/27 pages, Google 7/35 pages, MicroSoft 5/6 pages, w3.org 2/4 and nsf.org 1/2 pages. Beside these pages there were 11/28 sites that had their only PR10 page drop to a PR9.

A poster Phil_AM at webmasterworld.com had this to say on 28th of September.

“It would seem to me that Google is doing bi-monthly updates. Now the real question is are they updating PR or tweaking their algo?

Perhaps both, maybe their twekaing algo’s on the 22 - 24th of every month and changing PR’s on the 5 - 7th.

I’m willing to take bets that their is another wave of volatility around the 6th of OCT.”

Lot of people have hinted at Google resorting to quarterly PR updates. Only the time ahead will tell us what will be the PR update frequency. Now that it is confirmed Google isn’t going to abandon the toolbar PR atleast for now.