I think quite a few people keep a list of people they play with. It may just not be in that form. Think about it.... A lot of people, us included, like to chat with people before we decide to meet or after we meet if we hit it off. You would keep that person or couple on your yahoo friends list if you use that chat system. Then on top of that, if they give you their phone numbers, you may have that in there too. So thinking about it that way, I believe a lot of people do have "play" lists. Yes, you may not have played with everyone that you have on your friends list, but most people could pick out everyone on there that they've played with.