courier - 8:56 am on Feb 29, 2012 (gmt 0)
Odd, I was thinking the opposite. Are they saying "Neener-neener, we did all this stuff four weeks ago and nobody noticed?"
One of my sites did a lot of bouncing around in the first page before settling in the best position for 2 years around 2 weeks ago. It had corrosponded with some link building, so I presumed it was was this.
My thoughts as to what they have changed, although this may already have been changed, and I could be behind times, I am sure someone will soon say :) could it be where the link is hosted eg. a link for a UK site from a site hosted in the US is now counted the same as hosted in your own country. Most people go with the cheapest host they can find rather than where it is hosted.