this site was originally based on wpmu, due to some programming issue. such as theming and content integration between wpmu and phpbb. wordpress is the best blog system we could find in the world. but the reason why we switching is it lack of CMS function that we needed to build the site. so that finally we decided to convert it from wordpress mu to drupal on 20070919 for easy maintenance. Now we are still working on make the new site to be a multi-user blog system. thanks everyone for your support!