Allow people to signup for extension notifications

It would be useful for people to be able to sign up for notices regarding an extension. Perhaps a sign up form on the extension page?

While this could be abused to some extension providers, I think the benefits outweigh the risks. Perhaps the message could be moderated in some way?

A question related to this: http://civicrm.stackexchange.com/questions/8830/how-to-communicate-with-the-users-of-an-extension