Try Dr. Divx found at www.drdivx.com. Also try www.videohelp.com - lots of 'how to' posts to help you.
SF
After ripping movies from DVDs I always get so many separate video files that usually add up to around 5 gigabytes. But I also have some .avi movies that are less than one gigabyte of that same movie. How could I convert all of my separate video files that I recieved from my DVD rip to the .avi format so that I could save space on my hard drive?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic