I don't understand Google's thinking. I own over 100 domains and about 78+ websites and I have a couple crappy sites because they are not finished and I am still working on them. One of them went from a N/A to a PR2! I couldn't believe it because I have good sites with substantial back links that went from Pr4 to PR1 or PR3 to PR0! Damn...the insanity of it all!
My PR dropped from PR3 to PR0 yesterday. My site was listed on the first page of Google Search with some keywords for a long time. But today, I cannot find my site with those keywords My site is green content, no illegal at all, more than 4000 backlinks...