LOTS of Karen Voight ones that I absolutely love, particularly Yoga Sculpt, Circuit Training, Great Weighted Working. Angles, Lines and Curves. Pilates Precision Method. Classic Pilates.
Use them all regularly. Now using a pregnancy yoga one a few times a week.
Plan on using them post-partum in addition to ditching the bus pass and walking the 2+ miles into work - uphill on the way in!- every day to get back to the level of fitness I once enjoyed.
I have never had a weight problem, but I have had many soft tissue injuries, so most of the videos I use focus on strength training, core stability, balance and flexibility.