I'd like to see something kind of like a live-updating classified section with its own UI. A place with more info than the /who UI brings up. For example, a LFG and LFM tab with an option to sort by Planet or Flashpoint. Give people space to have a message, and keep track of what roles are covered by which members of a group or listees in LFG.
Basically take the system we hardly use and make it actually useful. The reason most of us don't use it is likely because the current system provides hardly any information and a ridiculously tedious method of searching through it. If everyone looking for a group or looking for more listed in the current system, we'd have too much presented to us in a fairly unsortable/unsiftable manner. So you have the dual problem of it not being used and also not feasible for us all to use.
