Hi,

before i start to convert my MPEG's i did a little test over night:

Source:
Video: NTSC-Film; (MPEG-1 1150 Kbps CBR, 352x240, 23,976 fps)
Audio: MPEG-1 Layer II 224 Kbps; Stereo; 44.1 kHz
Length: 823,748 MB

Conversion to: DivX (see codecs below)
Video: unchanged (1150 Kbps); Keyframes every 10 seconds
Audio MPEG Layer 3; 128 Kbps (LAME codec)

DivX4 LOW MOTION : 733,085 MB (59 minutes to convert)
MS MPEG-4 V3 ........: 729,723 MB (54 mins)
DivX 5.01 ...............: 715,655 MB (60 mins)
DivX 4.12 ...............: 715,061 MB (57 mins)
DivX4 FAST MOTION: 362,752 MB (57 mins)

Again - the superior winner is DivX4 FAST MOTION.

Will do some more test with different "types" of movies though..