FriendsFacts

Remember friends level, class and location on the friends list after they've logged off. If you've moused over them you also save their pvpname, sex, race, and guild.
Thanks to George Warner for this original hack.

Reset list: /script FriendsFacts_Data[GetRealmName()] = {};
Manually disable PVPName: /script FriendsFacts_PVPName=nil

http://www.wowwiki.com/FriendsFacts