dvd burning

Thanks very much for the help in the previous thread that I started. Again, I'm well pleased with my pb, find it far more practical than my pc at work.

However, I'm not sure what apps or software I should be using to copy and burn dvds. My gf has been bugging me for ages to burn her a couple of the movies that we've bought, however I haven't a clue where to start. Is this, presumably, something that I can do with iDVD? Is there something similar to iTunes where I can import and then burn?

Thanks very much.