I am working on a site and I want to have it where certain books on a suggested reading list can be rated individually by the users. I want there to be a bar which indicates the score and will update and refresh automatically when someone rates, but also has the built in feature that won't allow a person with the same IP address and/or a particular cookie on their computer to vote again.

Does anyone know how this could be done? If so, do you know a place I can get the code I need for free?

Take a look at this page and see if it helps: Poll Your Visitors with ASP
Dwight