I've just discovered the "Public Records" section of LexisNexis, the online legal (and more!) research service that I'll have access to for free until I graduate. I can search voter registration records and see where people are voted, including their address, phone number, date of birth, and political party. If I know someone's address I can find out how much they paid for their house, and if I don't know their address I can look it up via the "People Finder" function. In many cases a successful People Finder search also produces the full names of the person's immediate family. I can also do a nation-wide search for criminal and civil filings, as well as state and federal tax liens.
The information isn't necessarily up to date, but it's pretty damn close. Nor is it complete. There are no California voter registration or marriage records available, though California death records are freely accessible.
Now I must find a way to use this power for Evil. Does anyone have any old crushes they'd like me to track down?
Say it with me, now: Mwa ah ahhhhhhhhh...