Dealing with fields ended for me when I left television for film. DVDs came later and I had heard conflicting reports on how DVDs handled them. 

I have noticed field problems in some DVD title sequences from time to time.

SandyKG, if your project has any shot where there is a strong lateral movement; where the camera pans from left to right or someone walks across from one side of the screen to the other or a car drives by. Burn your DVD and look at that scene and consider how the motion looks to you.

If the motion seems shaky you might want to render it on fields and then see how that looks.

If you shot video that will have fields in it whether you like it or not. In that case, if you're doing any effects on a live action shot with fields your CG animation will need fields with the same field dominance. 

I'm glad I haven't had to deal with these questions for a while but I'm intrigued at what the real answer is. Hope I haven't made anything too confusing.