Hi, not sure if this is the right place to make this suggestion, and I don't know if it's already been suggested, but anyway:
It would be nice to have a way of listing recent activity (such as replies to discussions) in all of the groups I belong to. This way, I can see if anything interesting is happening, even if I'm not 'following' a particular discussion. It would be a blended list of recent activity for all my groups.
At the minimum, it would be nice to be able to view my list of Groups sorted by 'latest activity', instead of only by 'most recently added'. That should be easy to implement. The main site's group list already has this option, but it's not filtered to only my own groups.