rfgdxm1 - 4:47 am on Sep 23, 2004 (gmt 0)
I'm seeing almost no changes on a set of SERPs that are very uncompetitive. Pretty much all the top listed pages rarely change content, and I wouldn't expect the backlinks to change all that much in a short time. This leads me to suspect the changes you are seeing is new data (new pages, new backlinks, etc.) folded into the same old Google algo. Any broad algo changes would be expected to effect SERPs across the board.