You deposit the item & leave a price there for how much you want it to sell for, and then you can go off & do other things. Then when somebody buys your item, you get a message saying your item has sold & either the payment went straight to your bank or is awaiting collection from the shop.
This service would be available to everybody aswell, so the shop could have hundreds of items in it which people could browse through & buy if they felt like it.
It would just save a lot of hassle of having to keep spamming what you're selling & would be a lot easier. Sure there's the section where you press "P" and can view what people are selling, but you need to be in the town otherwise it disappears from the Party Search box when you leave.
Anyway, what do you think?

Oh & please don't flame me if this has been mentioned before or is available in other games etc, as far as I'm aware no other game has this option, but I could be wrong.