I noticed on Friday that my sites that previously had a PR 4 had dropped to PR 0. Later that night most were back to a PR 2, except for two of my sites.

Now, I have PR 3 on one site, PR 2 on another and PR 0 on my other two.

Anyone else noticing this bounching page ranking over the weekend?

Not all pages of your site (may not) have the same page rank. a "www.site.com" and "site.com" will have different page rank also

It could also be that Google was having problems with its server this weekend. I didn't see anything. I did see some reports from some folks in another forum that complained about traffic dropping in half this weekend and wondering if there was a Google Dance going on.

I'd be surprised if Google was updating PR so soon after the last update.