You are correct chuckeril. C renders in square pixels, and should be re-sized to fit the aspect ratio of dv, i.e. 720x480.

I have found that dropping in a 720x534 animation file gets re-sized automatically inside Final Cut Pro, which is what I use to composite and finalize my images.

However, I disagree about the compressor to use. Even if you drop a DV-NTSC compressed file into a DV-NTSC project, the file will have end up having de/re-compression artifacts, and as such I prefer to use sequenced TIFF images. They will stay full quality until final output when the compressor renders to 5:1 DV compression.

Also, using sequenced TIFF images allows for using G-buffer channels that can allow for more flexability in the final composite. It ends up taking more hard drive space while I'm working on a prjoect, but I can always archive the project when I'm done to CD and free up the space again.