I'm not sure if this has been requested/discussed before but I couldn't find any threads about it. Ah well.
One of the things I miss the most with this game is the ability to search for group members in a special chat. It's pretty hard to find people to do quests with just by shouting in the streets, especially at higher levels and it might take forever to wait at the spot for other players to join in.
It would be really useful with a kind of LFG (looking for group) chat window of some sort. That would help questing and finding new buddies to do quests with.