There are some internal changes made to our database. Now all the websites monitored by us are categorized by their topics internally; the classification is made by our editor, not by submitter. In the top-20 page, we then list the top-20 sites in each category in terms of their average crawling cycles. The top-20 rankers in each category are automatically updated as their stats change over time. The top-20 list will give you an idea of what kinds of sites are favored by search engines in each category. You should be proud of yourself if your site make the list.