I thought the ability to use my voice for personal verification would be coming from Google before anyone else made it available to me. Big ups to Vanguard for bringing some new technology to financial services quickly.
This was really easy to set up too. I opted in from their site, and they called me with an automated system. From there, all I had to do was enter my last four SSN digits, the eight digit code they gave me on the screen, and repeat the same phrase a few time.
Bam–now they can validate my identity automagically!