Editing Quicktime/mpeg video

After looking here, I got MacTheRipper to import video I have on dvd. I started with a collections of cartoons. all the cartoons were grouped into 1 file. I want to divide up the movie file so that all the cartoons are separate movies that I can then put on my blackberry for my daughter to watch when she is getting board. What is the best and cheapest way to do this?

Note: sorry if something like this has been posted. I looked but didn't really see anything.