Plus, since you can skip to a specific page, change the brightness, and fit the page to the screen width (convenient now that people are scanning at very different resolutions) with a single keystroke, CDisplay is a really nice solution, even for those of us who do have a million different ways to pick the files apart.
As for the storage media, DVDs hold more data and I'm guessing that, unless your computer is more than a few years old, it can read them as well as CDs. But if you only have a pile of blank CDs handy from those crazy pre-iPod days, there's certainly no problem in using them instead.