Any chance of a Diablo 2 style game selection window that has open public games +/- 10 levels from yourself that you can browse and join.
eg: When you start an online game you select whether it is Public or Private, give it a name or location and whether to allow players over the +/-10level difference to join.
Then others will see your game on the list and can join you to play or trade. Or you can browse for games and join theirs, this will allow players to link up online so much better.