I'm using AutoGK to convert my entire DVD collection to XviD.
I use all default settings and Target Quality 75%. By far most of the movies come out great and I am really happy with AGK and would not consider changing.

However, I have a few titles which come out with some problems with motion such as a car passing through the picture it will not be a smooth motion. Other than that the picture quality looks OK.

The titles in question were oddly enough all TV movies in 4:3.
I used GSpot to see the framerate of the original DVD (VOB) files and it is 29.970 and so is the output XviD file.
The only thing I can see is different is the frame resolution where the original is 720x480 and the output XviD is 720x544 (this I have seen on other 4:3 conversions and has always been beyond my understanding but never complained because it usually looks OK anyway).

Any ideas would be appreciated!