Friendlist management

As my friendlist grows, I'm starting to loose more and more track of them. One feature I would really appreciate, would be a system to create multiple friendgroups, while being able to have a friend in multiple groups. This wouldn't be any groupchat system but only an organising purpose.

You would have your current global friendlist but also the possibility to list friends in groups, like school mates, communities etc.

Another thing would be to see the common servers on the firendlist itself instead of having to look up for each friend.