If you have a dual-format DVD Recorder (some iMacs and G5s), you can use iDVD and Disk Utility to get the video on to DVD+R format. First, create your project as normal, and burn it to a DVD-R disc. Then take use Disk Utility to make a disc image and save it as a .CDR file. Then insert a DVD+R disc, click your disk image in the Disk Utility window, and then burn it to disc.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040406142022184