Don’t feel alone in you recent PR drop from Google. Many other prominent websites have also been hit. Page Ranks for sites in all industries have felt the pain of PR decrease. Unfortunately Google hasn’t explained why, so knowing what to do to can be troublesome. The best bet is to read Google’s guidelines for advice.
Here’s some examples of big business sites that were also effected by the PR decreases this month.
http://www.washingtonpost.com/ PR7 to PR5
http://www.forbes.com/ PR7 to PR5
http://www.suntimes.com/ PR7 to PR5
http://www.sfgate.com/ PR7 to PR5
http://www.statcounter.com/ PR10 to PR6
http://www.engadget.com/ PR7 to PR5
Source: Search Engine Land