DVD Catalyst is a Web-based service that lets you take your own DVDs and compress them to load onto your iPod, iPhone, PSP, Smartphone and other portable devices. It's pretty simple, you choose your portable device type, load a DVD and let the software do the work. An advanced version (about $20) comes with better features, including the ability to segment your videos, control quality, etc., but the free version should suit most people's needs.