Thanks for breaking this down for me, Sheryl, and thanks to everyone who took time to read my quest and fire off suggestions.
I will look for the AIC export option and try to select the maximum quality settings available for it, and then hand that resulting file to my producer.
I have an old Mac with iMovie HD on it, so I will also try importing the AIC export into that and the exporting to DV, as that DV seems like it would be better quality than the DV coming out of iMovie 09. (I seem to remember doing DV exports back in 2006 and being quite happy with the results, which is why this process has been so confusing for me now.) If the producer NEEDS a DV file, I reckon that's the best I can give them right now.
The consolidate project option sounds VERY COOL. I had no idea that was possible! For working between Mac users, that might be just the ticket I need. That also sounds useful when trying to throw away all the extra, unused footage and just keep the parts of the footage that I actually ended up using, but may want to tweak titles and effects later.
Long term, it sounds like I am going to have to transition to FCE or FCP. I will go surf the Web for reviews and impressions of it. I'd be happy to hear more about people's opinions. Investing time, energy and money into a new tool does not appeal to me, but I am definitely going to need full quality DV exports sometimes (anytime we want to get our PSA on the local television channel, for one).
I guess iMovie is still useful for my mini-YouTube fun time projects, (my latest:
http://www.youtube.com/watch?v=g9TrAZ4yCDQ), but it is a shame that it can't produce something in which the future-proofing is limited only by source quality, not the software's output quality.
(I don't mind limitations based on source quality, them's the breaks! But potentially losing source quality forever because of shackled software is...
GAH unforgivable.)
-D