it's called the friends relationship system.
instead of mutual friends and the numbers of friends that listed u,
how about a list of friends with 3 different colors. like red, green
and blue.
red would be you listed the user as friends.
green means mutual friends.
blue means users that listed you as a friend.
see this for an example:
http://blasted.50webs.com/dbmockup.html
ignore everything else and see the friends list on the bottom.
this is what i'm tryin' to talk about.
/jaime