Popcorn simplifies what used to require DVD2OneX and Toast, for a very nice price. You'll still need DVDBackup or MacTheRipper to pull CSS protected DVDs onto your hard drive first, but these are both free.

The quality of Popcorn's compression is extremely good, considering the large amounts of data it is throwing away. I made a backup of Antz, a dual-layer DVD originally over 7.5 GB, and Popcorn compressed it 44% to fit on a DVD-R. The resulting copy looks great, with only a few jaggies showing on the almost-still opening credit text.

While it lets you choose to keep the entire disc or just the movie and certain audio tracks, this is the one disappointment: Popcorn decides which is the primary audio track, usually DD 5.1, and offers that one or all. Period. If you prefer DTS, you'll be forced to waste space and keep all audio. If Roxio can improve this one problem area, I think they'll have a 5 star product.