ifidie.org website gives you a way to write notes that will only be delivered if you die
The service is free, easy to use, and completely secure. Use this website to leave instructions for what to do with your pets and journals, to write letters to the people you care about, or for anything else you want. It's not as morbid or scary as you think; it's an easy way to be prepared just in case something totally unexpected happens.
What sort of notes can I write? This is really up to you, but here are some ideas:
* A letter to a friend - to say something personal.
* Simple instructions - whether or not to read your journal, what to do with your cat, where your documents are kept.
* Passwords - how to log into your computer, how to access your address book.
* An informal will - so your next of kin knows what to do with your stuff.
My last such service "died itself" (Deathswitch) and ceased to exist but this looks like a worthy successor. You only need these services for if you die - if you don't die you can switch to a new service, and if you have died it activates and is not needed a month or so later on. It will also confirm with trusted friends (the Safeguards) to confirm you have actually died before it releases the notes.
This type of service is really zero effort and whilst it is no official will and testament it can give direction to your friends and family in terms of your wishes, where to find things, how to get into your computer, etc.