Web-interface to subversion repository is accessible online at SEUL.org's ViewCVS.
To checkout source use this subversion command:
svn co svn://seul.org/svn/pygame/trunk
You can find development binaries at " The Spectacularly Adequate Automated Pygame Build Page". Mac and Windows binaries are built after every svn checkin, tested, and then uploaded.
A feed is available for changes to svn here.
Instructions on how to build can be found in the Compilation section of the wiki.