I am one of the core Drupal developers, and I am busy working on a versioning / installation framework for Drupal, from which we want to build rss feeds of all the available modules / themes for each version, with direct integration into the admin system.
So you’re right , the problem is ideal for RSS … and we are working on it .. but it will be a 4.7 thing, which is only expected in another 6 months at least =)