Was thinking that perhaps trading house network in game, like a third party/drop shipping firm.
Something where I can post items I'm willing to trade for another item... say like I have a vorpal bastard sword that I'm not proficent in but would like to trade for like a vorpal kopesh.
Could post this up like an auction and add a brief description of what I'm looking for. Set it up that someone can post an offer and then it has to be accepted by both parties before items change ownership, like in the AH where the item is removed from out inventory, but still technically ours.
I think added functionality would be to be able to offer up 5+ items for a single trade, and both parties could cancel the trade at any time and have postings like expire after a week or something.
Think this would be helpful since not everyone trolls the forums looking for a tradeable item and then don't have to arrange a meeting time or risk of sending item to wrong person or what not.
Details of the setup I can see as...
item offerings (always just for 1 item to be receive)
money with item offerings for an item
Description of what your looking for
search (not sure on this, maybe search on posting keywords, or item levels...?)
just a ruff idea, perhaps others can add thoughts?