I remember Dab was talking about a way. Something like this:
There is an email service (I can not remember it), you write an email, schedule it to send it to whatever recipient you want. You will set a periodic timer too. Say every two weeks or months whatever. If it's every two weeks then after every two weeks this client will send an automatic email to you and you will have to open it and need to click certain button/link so that it resets for the next week. Now if this email is not opened and certain button was not clicked then the client will send whatever email you scheduled to sent to your recipient.
You can talk to your closest one that they will receive an email with instructions to access the Bitcoins you have in case you have an accident or a sudden death.
Doesn't sound like a solid idear to me as it is... The email service admin (or any tech guy that works for the email service, even as an intern or an outside consultant) might be able to open the scheduled email and read the instructions... Would be a great way to have your wallet drained if you ask me. Not to mention any security vulnerabilitys that would allow a hacker to get his hands on those scheduled mails.
If you found a rocksolid email service like this, the least you should do is encrypt the instructions using a very strong pgp pubkey, for which the privkey is helt by your recipient...