The advantage of a DVD? Not having to download hundreds of megabytes of stuff, including much you will never use. It's a non-issue if you have a fat internet connection.
As of last weekend I am officially Linux-only at home, with this notebook and an AMD64 desktop both running Ubuntu 9.04. I could only think of one Windows application that I use that has no Linux version or equivalent, and that's a game (Guild Wars) that I got running under Wine.
(The desktop still has its Windows installation accessible at boot, in case I need to get to a program to convert data or something, but disk will eventually get pulled out and turned in to a NAS disk.)