It would really depend on the content of the database.
Jacob - WebOnce Technologies - 30 Day 100% Satisfaction Guarantee - Over 5 Years Going Strong! Website Hosting, PHP4&5, RoR, MySQL 5.0, Reseller Hosting, Development, and Designs
Well if you wanted to market a product to a certain group of people in the US, I have a friend who works for a marketing company, he's got about 300 million americans in the database, waiting to take orders... But then it might cost you a few hundred thousand to get any work out of them... =P
It really depends on what you want? A lot of data in db's is collected for the particular site you are on and is non-transferable... ie, like the db for this site. Kind of don't think webhostingtalk would want to make their posts free to the public...
Maybe elaborate a bit on what it is you are looking for? Someone may have something they can give you?