I was wondering if any of the ewallet providers have some form of dead man's switch. Let's say Bob has 200 BTC in an ewallet, and another 5000 offline somewhere. Could Bob set up a system so that, if he dropped dead, his wife or kids would get an email with detailed and fool-proof instructions as to how to retrieve both amounts?

I'm thinking it would be a fairly simple thing to set up, and it would definitely add value to an ewallet service. All other things being equal, I'd choose one provider over another based on that service.

Cheers,