I don't think there is much documentation about. Are you familiar with setting up symfony 1.0 applications, and subversion? If so, it will be easy. Just check out or export the source from here:
http://trac.snipeet.com/browser/trunk
using your svn client. Then just edit /config/config.php to add the lib and data variables pointing to the latest 1.0 release, and clear the cache.