It would be nice to have a history log (for the last 24 hours or so) of people you partied with.
For example, after a server restart, you could check when you joined some players in a party and who led them.
One could also see, when players left or joined and when one became party leader, went solo or was removed.
Timestamps, depth and/or level map names would be nice.
Party Member/Leader History
Sat, 08/27/2011 - 21:05
... or you could ask, why you have been removed from a party right after joining, because this happens often and i am becoming more and more interested in the reasons for this.