londrum - 9:17 am on Apr 26, 2011 (gmt 0)
maybe it only applies for that particular search term, and not for all other search terms.
imagine if you were searching for a news story, and you went to the BBC site and came back quickly. google might suppress BBC news stories in the SERPs for you next time. but it wouldn't make much sense to suppress all the TV stuff, history stuff, radio stuff, and everything else that's there.