There is an announcement list, which you can subscribe to at http://urchin.earth.li/mailman/listinfo/photopub-announce
There is also a list for people interested in development, at http://urchin.earth.li/mailman/listinfo/photopub-devel
For the time being there is no users list, so please subscribe to the
development list for help. Once we have decent documentation and a stable
release, a users list will be created.