anyone check your blogs, it seems to only affect blogger, WP, Tumbler etc. and not TLD based domains. got 7-10 of my blogs dancing up and down, 75% of them have no changes your insights please... I think this is a good move in part for Google, updating many times the sub domains and doing the quarterly updates for major sites
Do you mean PR Export / Update or simply "got 7-10 of my blogs dancing up and down" your websites are moving in the SERP's which called Google Dance ?? However i haven't seen any PR export or changes since a while!!
Yes, I agree with MRniceGuy007. My website http://www.winuxsoft.com get down 4 to 3 on 5th Sept 2008. There is few update going on to Google PR.
Unless you're trying to sell your site or sell links on your site, I wouldn't worry about PR too much. Everyone should be more worried about unique visitors....that's what makes you money!