Attached Link: http://www.vcdhelp.com/comparison.htm

This may be a little off topic, but the information may be of interest. The link goes to a site concerned with capturing video on a computer and creating VCD, SVCD or DVD disks that can be played. It lists the major video compression standards (MPEG1, MPEG2, DivX, ASF, RM, etc) and provides a table showing things like standard resolution for PAL or NTSC, rough conversions of what a minute of video and audio would be in terms of MB of disk space, and the relative quality of the video image and sound. its also a great site for tools that can be used to edit various computer video formats.