If you want to be informed about which packages enter Maemo Extras (and Extras-Testing) in the Maemo.org repositories, you can now follow the user "maemoextras", which will automatically post links to the packages interface whenever a package is promoted to Testing or Extras:

http://twitter.com/maemoextras

(It reported packages entering -Devel as well, but that was too much noise for my taste, so I deactivated it.)

Improvement suggestions welcome!