I found that the quicktime render has all the normal choices of codecs, alpha channels, color bit depth that one would expect. Now I just need to get it set up for 720X485 nonsquare mode.

Thanks everyone for the responses. I have purchased Poser, bought the "Poser 6 Revealed" book and have embarked on trying to figure it out. Yes Quicktime is available although I can't see that you can choose between codecs, it's just a very simple output interface. It's good enought to get out to After Effects which is where all the graphic work for the project will be assembled.
Thanks again!