You make whats called a "VCD", which as you would guess, would be a lower quality movie then compared to a DVD.
You'd have to re-encode it to fit a CD, and since most DVD players don't play DivX, XviD, you have to burn it uncompressed. Which means you can only fit about 30 minutes of watchable video per CD
goto
http://www.vcdhelp.com for some tutorials