how do i save a dvd to my computer?

is there something i can downlode off the net (free)
that will make this easer
cuz i have an 80gig ipod and alot of movies
if its complicated a step by step would be nice
thx a bunch

DVD Shrink will turn the DVD into a .iso file, which can then be converted to avi or something with another program.. But i am confused.. do you want to take movies that are already on your iPod and save them on your PC to clear up space on the iPod? Or do you want to take DVDs you bought at like wal-mart and save the movie to your iPod?