To report bugs or request features, see: http://bugs.shaftnet.org/.
The Photo Organizer web site is a wiki, allowing anyone with an account to make changes. Anyone with a bugtracker account has wiki permissions; just sign in with the same username/password.
Current development plans can be found at the Development Plans page. This page also lists changes not present in the -stable tree.
Source code to devel tree is available via subversion at: svn://svn.shaftnet.org/po-devel/trunk, or via a web interface
The -stable release (>=2.34-rc3) code is also available via subversion at: svn://svn.shaftnet.org/po-devel/branches/stable, or via the web.
The old_stable release (>=2.33e) code is also available via subversion at: svn://svn.shaftnet.org/po-devel/branches/old_stable, or via the web.
To subscribe to or view the mailing list archives, see: http://www.shaftnet.org/mailman/listinfo/po-devel
Subscribing to the Photo Organizer project page on Freshmeat.net will not only tell you about new releases, but will also help the developers gauge ongoing interest.