I'm a workout DVD Junkie. Funny thing is they don't work if you don't actually DO them. LOL.
Some of my favorites:
Hip Hop Abs - High energy and fun.
Rainbeau Mars Sacred Sweat - Fantastic Yoga workout. Afterward you feel like you've conquered the world.
- Not actually a DVD but there is a new yoga video everyday and you can download them and do them whenever it's convenient.