Sina opens an App Engine service, named SAE, some while ago, and is now at alpha 2, public for registration in China.
This SAE service is very similar to Google App Engine in that it provides a cloud environment for applications to run on. Unlike GAE, SAE supports the PHP + MySQL combination. This means, potential, more web applications could be migrated to sina app platform. Actually, the famous blogging application, Wordpress, is already migrated. Although flexible, the use of MySQL as a database storage might mean the scalability will not be so good.
Sina App Engine and My SAE App