keyplyr - 8:48 am on Jan 16, 2007 (gmt 0)

As reflected by Moncao in msg#:3218857 and jtoddv in msg#:3220138 of this thread, the penalty points to over optimization, especially with keyword saturation. I also thought this might be the cause of my site disappearing from the SERP for several search terms, so I took action.

I used one of the keyword density tools available through a search at our friend Google, and verified those same keywords/keyphrases. I then reduced keyword density by 20 to 30% for those search terms, and voila - back to normal ranking in SERP across all data centers. Took a little over 24 hours.