Package Status
http://jhdebuild.0d.be/packages.html lists (or used to list) upstream GNOME packages, along with their Debian maintainer, whether they are maintained by pkg-gnome, etc.
http://www.0d.be/debian/debian-gnome-2.22-status.html lists all of pkg-gnome’s packages of GNOME 2.22, indicates whether they have been supersceded by new upstream releases, etc.
The same page has been generated for older releases of gnome: http://www.0d.be/debian/debian-gnome-2.20-status.html http://www.0d.be/debian/debian-gnome-2.18-status.html http://www.0d.be/debian/debian-gnome-2.16-status.html