McMohan - 7:01 am on Feb 14, 2011 (gmt 0)
If x site gets x amount of links with the anchor text "keyword" in a "x" period if time
There are instances where this broad-brush approach should not be used. Such as an upcoming sporting event. The official website usually gets hoards of links with almost same anchor in a short span of time. Contrary to filtering that site out, it has to be placed at No.1 position.