I have several domains - each with properly formatted site maps. Google carefully reads the robots.txt file and all of the sections of the site maps and then may read a page or two - every day the same. Yahoo reads robots.txt and parts of the site map and then spends much of the rest of each day reading many different pages. This pattern has repeated for the last two months. It is not a major problem as most of my business has always come from Yahoo but it is curious. Thoughts???