jakegotmail - 8:22 pm on May 2, 2007 (gmt 0)

turns on and off a switch

I see the same thing with a competitor site and have been for the last 4 months. It comes and goes. Its authoritative weight goes in and out. Occurring more frequently as of late, the yo yo bouncing affect.

This turn on and off feature IMO is their link devaluation filter that they have been hyping for the last year.