TV safe area of a DVD!
One of the things that you have to consider when making a DVD (especially the menu) is the TV safe area. Many older TVs (many new ones as well) don't display the full image. I really figured that out when I hooked up my Mac to a LCD HDTV through DVI to HDMI. I set the TV up as the second display, because if it was the main display, I nearly lost all the Dock and the Menu Bar because of how much the TV wasn't displaying. So when you make a DVD, you really have to make sure that nothing important is on the sides. Thankfully, Apple integrated a feature in iDVD to make sure of that. You can easily access it in the View menu. It is "Show TV safe area". You also get it with "Command - T". At the same place, you can get the "Show Standard Crop Area" feature. This will show you exactly what you will lose when displaying a widescreen movie on a regular TV. You can get it with "Option - Command - T".