I had a DVD I got in a swap, it was the one with the "give me 20" and "fun-damentals" workouts. I found it incredibly boring. I think there is so much more you can do in that amount of time, a better routine with less talking that will get you more results.
If you like workouts with simple choreographies, Prevention has a DVD called "The Sugar Solution Workout" which includes a cardio walking workout, a strength routine divided in short segments (so you can easily fit it into your schedule) and a yoga-inspired cool-down.
If you are interested in flattening your stomach and/or working on your core, I would recommend one of the following:
- Lotte Berk
- The Bar Method
- Pilates: Winsor Pilates, Quickfix and 10-Minute Solution all include DVDs with shorter workouts or wkrouts divided in short segments.
Check out Collagevideo.com, they have previews of a lot of videos so you can get an idea of what it entails.