I don't like to be obligated to open source my server side project of doufu sample game, though it is just a 'prove of concept'.

So rather than GoogleCode, I decided to use Beanstalk (http://www.beanstalkapp.com/) which is a cool svn hoster allow me to use 20mb svn space without charge, and it also allowe me to integrate my project with the other web2.0 service, such as twitter or basecamp.