I LOVE MTV's Yoga! I always sweat during it and feel it really does stretch me out and lengthen me. For something that's more cardio, I'm old school and like Tae Bo, lol. I have Cardio Circuit 1 and Get Celebrity Fit, Sculpt.
I have the Jackie Warner DVD and really like it. There are 3 20-minute segments - core, lower body and upper body. It's great how she mixes in the weight training and cardio.
I just got Jillian's Shred, but haven't tried it yet. This is funny: when zipping through it, I noticed it's taped in the exact same studio as Jackie's. It will be like going to the same gym every morning - ha ha.