Footprints
Footprints! Yeah! That's what I want!
When someone walks on a page, little footprints appear by the icons on the top, or something. They stay there, but get softer and softer, for about 10 minutes.
If you roll the mouse over a pair of footprints, you see the user name (using the title attribute of an a href?), and if you click it, it takes you to that user's wiki homepage.
Unregistered users footprints don't link anywhere, they're just footprints.
If there's a lot of footprints all at once, they get aggregated or something. I don't know.
If you could put a little mouth icon next to the footprints if they happen to have Jabber IM open, that'd be even better. But I just want the footprints for now.