PyGTK 2.7.2 is now available on ftp.gnome.org:
ftp://ftp.gnome.org/pub/GNOME/sources/pygtk/2.7/

What's new in 2.8?

See the wiki page for an overview of news in 2.8:
http://live.gnome.org/PyGTK/WhatsNew28

What's new since 2.7.1?
- Subclass/type registration bug fixes (Gustavo)
- Allow gobject to be initialized twice (Yevgen Muntyan)
- Deprecating warning bug fixes (Mark McLoughlin)
- Bug fixes (Sebastien Bacher, Gustavo, Johan, Manish)