I've had realpokertraining.com drop from 3 to 0 recently as well. Actual traffic is still high... so don't know what's up with pagerank.
my site raise from 0 to 4, hopfully will be pr5 from the next update, anyone here who know when will be the next google updated? http://www.addthisto.com/
You can check it at checkpagerank.net I think they are pretty good. My PR4 site is still a PR4. I have a different domain that is 5 yrs old, that had made it to PR4 about a year and a half ago, and then it dropped to PR1about 6 or 8 mos ago. I think maybe because I had AdBrite, and "Free Relevant Links". Have removed AdBrite, but no change in PR yet. (Boo Hoo)
no change for my sites. Though it shows PR 7 for www.timesofindia.com but as officials as decided to redirect timeofindia to times.indiatimes.com it is showing pr 0.
no changes for my sites....except one site(that I haven't even touched for months) now shows as forged PR on checkpagerank.com
Seeing some changes. Damn google, i normally wait for ages to get pr updated. And now that i thought i had the time to do some good seo it already started.