This site basically provides a 3 step process for ripping video from DVDs for use by iTunes on your Mac.
#1 is Insert a DVD in your Mac’s DVD drive
#2. Use HandBrake to rip and compress the movie
#3. Add to iTunes, and enjoy!
Of course, there is more detail, but the author at this web site should get the privilege of telling you how.
See it here: http://johnzeratsky.com/articles/2006/how_to_rip_and_compress_dvds_in_mac_os_x
