You can now leave your email addresses, blog login details, infact all online logins etc to your family. If they are mentioned in a will, then your family will be given the access by the hosting companies. Or you can leave a set of passwords to your family. there are even online srvices which manage your passwords and financial data for you and they pass it on to your family after you've passed on.
This post should help... http://www.securitynewsdaily.com/digital-afterlife-how-to-safeguard-online-accounts-after-death-0707/
Its not my post. Just something I found online.
My blog would probably die out eventually, since I have taken paid hosting services. When bills don't get paid, services get stopped. Naturally.