hotelmarketing - 2:33 pm on May 15, 2012 (gmt 0)
Several sub-domains were hit on my 14 year old site and several others had no impact. The only difference was the sub-domains which were hit used in house ads that resembled adsense ads and embedded forms. Unfortunetly, we didn't block the adsense like ads and embedded forms from googlebot. The in house ads were published on every page and we only used 2-3 variations of the adsense like ads and one variation of the embedded form. The inhouse ads were included in the body of the page very close to the text. A very painful mistake.
I blocked googlebot from crawling these ads about a week ago and submitted a reinclusion request last week using the penguin mistake form. Fingers crossed.
No link building has ever been done on the site. For the most part, traffic increased after each panda update. We place alot effort in building quality content and starting to focus on usability and site features.