Just about all of us have played MMOs or been involved in some sort of virtual world like Second Life. You play in these worlds for a year or two, meet some interesting people, upgrade your system and then wander off to the newest and shiniest MMO to come out. What about those friends you've left behind though? How will they find you in your latest incarnation? If of course, you want to be found.
If you do want to be found, you're going to want to go check out Avatars United.