Everything I have left will go in here... ATM I don't have everything in front of me, but I guess starting the list was now or never!
The only rules I have are as follows:
We agree via e-mail before final arrangements and addresses are exchanged.
Delivery Confirmation, it's already been said, but it helps to know on both ends when anything is being shipped or mailed.
Actual pictures of the cards to be exchanged... This is just to reassure both myself and whomever I'm trading with.