Synotrip.com provides a platform for travelers to connect with independent Chinese tour guides, giving them a greater selection of tour guides and reducing the price by cutting out the traditional middlemen in the tourism industry. It also contains thousands of pages of travel information for many cities in China.
Synotrip.com was re-launched in 2009 using Drupal as the base CMS. It is, of course, still being developed.
As of now (Jan 2010), the service is completely free although plans are to offer premium paid services to tour guides and possibly tour companies within 2010.
A PHP/Drupal pro partner would be a great addition to this team!