The most I know about is a site like
http://www.zabasearch.com that lets you find a little more information (sometimes) on people's birthdays/age, addresses, phones (land lines), etc. However, it's not always that accurate. The info they have on me is more than 3 years out of date.
I know somebody with knowledge of this topic -- and I kind of want to know more on this issue myself -- so I've sent her an e-mail, asking she join this site, and write up a little bit about what she knows. What's available for free to the public, maybe even what's available for a low cost (under $100).