I knew this data would never be useful. :P
graph.pl - point this at a directory full of friends.year-mon-day files.
The colors in the graph correspond to the colors of the links in the "Friends" dialog of LoserJabber.
(Also, this post was brought to you by
cat | loserjabber -u evan -a loserjabber -s "Friends Summary" -
'cause I'm in a computer lab and I don't wanna use the web update client.)