Just send your passwords and account information to me, I will insure it's proper use after your time on this earth is at it's end... lol
On a non joking note!
Me and my wife know all of each others passwords, but I would only recommend my solution to some one who is in a long term relationship.
On another note, you can put all your passwords and account information in a text file and throw it on a flash drive. Maybe put it somewhere with your will and some information in the will about your virtual goods. Might be something you would like to pass on?