with all due respect to the guy above, autogk conversion to xvid is lossy. (I rip alot of dvds using the tool, and it is great for what it does, but it is lossy) It is the similar to divx. Both area used to compress dvd to avi files which are much smaller than the original and then shared by naughty people on torrent sites. (if you want to get technical, avi is just a container)
If you want to extract the video from vob files on a dvd wihtout causing a loss in quality go to this link andhave a read. They make suggestions of several tools which can do the job.
http://forum.videohelp.com/topic224833.html
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