I'm really not keen on iDVD. I have very little control over the layout of my DVD - what plays, when my chapters exist, etc. The usability of the App is terrible - anyone recommend anything suitable for a Mac?
You may want to give Apple's pro applications a try: Final Cut Express and Final Cut Studio. If you're using iMovie '08, give iMovie HD a try first. There are many plugins available for iMovie HD. iMovie HD is available from Apple's Web site: http://www.apple.com/support/downloads/imovieHD6.html