rogue - 1:57 pm on Oct 8, 2003 (gmt 0)
George - Be convinced. I too noticed this same thing on an important page within my site a little over a month ago and decided to de-optimize my on page factors. (keyword density) I had it up to 22% and was in #3 for a long time until a sudden drop to #17. Brought density down to 10% on my target phrase. Two days later - up to #5. I have repeated this experiment three times in the last three weeks with the same results. The drop will vary a couple places depending on fresh results for other sites, but always returns to #5 despite other fresh results or even my own. I watch my log files all the time for googlebot who is as faithful as mans best friend.