A friend who is technological is a usual choice. There's also an automated tool for people who don't have anyone who fits the above description! Find out about it here
I also run account recovery for people I know, under the account ca-recovery, but again I only do it for people I know so that if they come and ask me to recover their account, I can verify it is really that person who I am talking to.
RE: Introducing Hive Score. A small Checkup for your Hive account!