DVD Decrypt (less easy to use but more powerful,better for scratched discs)
AUTOGK for vob > avi (divx or xvid) which is easy.
Use VLC player or similar for playback.
If you have some wierd/half corrupted video files that play but wont convert,use WINFF.
And if you want to play anything on a regular dvd player youve got to check if it supports divx or xvid,or old mpeg(2)(you can fit a few movies at 2000kbit if your not fussy)