This week's book giveaway is in the Testing forum. We're giving away four copies of The Way of the Web Tester: A Beginner's Guide to Automating Tests and have Jonathan Rasmusson on-line! See this thread for details.
Oracle would be a good bet. I don't know if they offer a download of just the drivers, but if they do you'll find it somewhere in there. Of course the JDBC drivers are shipped with the product - so if you have Oracle the you already have the drivers.