[slackline]

Somewhat morbid but this could prove useful in the event of your untimely demise...

Dead Mans Switch

I'd perhaps advise against storing passwords in the email that would be sent in the unfortunate event, even though it claims to encrypt them.

[rich d]

For some reason I was thinking this was going to erase your Internet history when you died, don't know why that would be useful.

[SA Chris]

Be useful for releasing bank details etc to next of kin, assuming it's totally secure.