Front Row is a new feature currently only available on the new iMac G5. Essentially Front Row is a combination of wireless remote and front-end GUI that allows you wirelessly control all the media on your computer in a very simplistic fashion.
I hope they release this for other Mac models, but really I hope they build this functionality into a new Airport Express. Ideally the Airport would have HDMI, DVI, or composite video out along with an IR receiver for the Front Row remote. All I would then have to do is plug in the video feed from the Express to the back of my TV and access all my media files wirelessly. Hey, if it doesn’t happen, it’s not like it would be hard to move my Mini into the living room.