Hi Lynne. I've had good luck at VideoHelp.com. The site is mostly geared towards Windows of course, but there is some Mac related expertise there as well. I usually check out the Mac forum
http://forum.videohelp.com/viewforum.php?f=9&sid=sid%3D3e556c22dbeb3d4e13446da2437ae934
I've generally found answers to most of my video related questions there, although I haven't progressed to the level of DVD authoring (yet).
Hope this helps!
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