The State of Missouri's treasurer Clint Zweifel recently became the second leader in the country to set up a process to email people whenever their name gets on the state's unclaimed assets list.
Residents must opt-in to be placed on the list by filling out their information here. And then in the coming years, if any bank account, utility account, brokerage fund etc... gets escheated to the state of Missouri, the treasurers office will email you and tell you how to claim it.
Since this list will be around for years, you should use an email address that will follow you around for years (such as a gmail or yahoo.com address) and probably not use a work email address that you my stop using if you lose your job or decide to retire.
According to St. Louis Today , the state is holding onto over $180 million of unclaimed funds and returned over $30 million during the fiscal year ending June 30, 2010---This included one lucky guy who received a check for over $1 million!