Effectiveness of Pentax Dust Removal System (in K10D)

The Japanese review site DC Impress have recently tested the production K10D:-http://dc.watch.impress.co.jp/cda/review/2006/11/22/5111.htmlWhen I inspected the series of the boat photos for the ISO sensitivity test, it was found that there is an obvious dust speck above the top left corner of the hotel building, in the blue sky. I was actually rather surprised when I first found that, especially