Thanks to the nature of the Web, several DVR blogs today had almost simultaneous mentions of a new media management app for Macs. It's called MediaCentral (not to be confused with Microsoft's Media Center), and it's from a company called Equinux.
This app performs most of the same media organizing and playback functions as Apple's Front Row but adds support for popular video formats such as XVID, DIVX, and even DVDs. It's also compatible with Elegato's EyeTV external TV tuner devices, so there's no reason for Mac users to feel left out of the DVR revolution. Heck, you can even control it with an ATI Remote Wonder.
Best part? It's freeware and available for download on the Equinux site.