I think this pigeon disease thing is serious man. Later edit : I just realized : the thread's subject is Google Updates.
Yea, Google has increased page rank on one our sites today and decreased page rank on another site. When doing future page rank check some DC’s show good results some non at all must be updating now.
If the TBPR update is not due till the Big Daddy updates are done and they do a new DC every 10 days or so, it may be several more months till the next TBPR update. From Matt Cutts Blog: Q: Is Bigdaddy still on track and launching? A: Yes. Remember that Bigdaddy involves new infrastructure and is not just a data push or algorithm update. Don’t take it as a promise, but I’d expect a new data center to be converted to Bigdaddy roughly every 10 days or so. Again, take that as a rule of thumb. There are smart folks doing this transition, and they’re deciding how to do it in the best way.
Thats good that it is 4, usually new sites dont jump to PR5 dirctly it sure will be pr5 if the sites continue to perform well and have good Backlinks.
If you have a google site map go to your site map page and look under crawl stats and the changes show up there. Before I had all low now a few medium and one high ranked page.