Not on a new Mac: It just works, seriously you plug in the DVI cable and OSX does the rest. It sets the appropriate resolution for your TV, how it knows I don't know, but let me tell you it does. Now some HDBeat readers aren't content when things "just work" and for those people there are advanced settings such as overscan correction and pre-set color profiles. Don't go looking in your display preferences just yet, they only show up if the DVI is connected to a HDTV.
The other thing that just works is sound. With the correct cable you can output digital audio out of your Mac to your AV receiver and enjoy your videos in Dolby Digital 5.1 Just make sure you plug the cable into the out, not the in like me, a quick search through the manual solved that one.
I am thrilled that it is this easy and I hope that future Windows PCs are this easy, yet another reason to look forward to Vista.