Would it be possible to create a module that would check for module updates? Here is my idea:

In each module the developer could put a link in the module to where the module resides like the module repository or the developers site. When the updater module wants to check for updates it would see the links and check them to see if the modules version number has changed. If it has then it could then notify you and then provide a clickable link to the updated version and when the link is clicked it would download to your local machine. At that time it would be up to the user to update the module.

I keep a list of all the modules that I am using and on what site. I also keep the current version number and then the url to the site I found it. I check all of these once a week to see if there are any updates. I was just trying to think of a way to make it easier.