so i have this 1.5 year old site and found that it has PR-5 a couple months ago. however, my main keywords are #5 and #15 which is shit. I probably have the highest PR among all sites in the same field. so i thought maybe its easy to push, given the high PR. i go back to SB, "blasted" a few thousand blog comments which, according to the link checker, was not even successful. except that i see adsense impression increased to 30-50 which is still pathetic. next thing i know? the SERP ranking disappeared! just when i was getting ready for a 1-mil SB real blast! strangely my firefox PR plugin is still showing PR-5 more than 24 hours later. is the plugin PR not real-time? wth is going on? what should I do now? someone give me a pointer?