I bought the Tracy Anderson mat workout about a month ago and I really like it so far. I've mainly only done the arm workouts and have to say that they are looking pretty decent now, they've always been skinny but I like the toned look. I saw noticeable results in about 2 weeks and friends were commenting too. Am doing the ab exercises now, think i'm a bit weird in that i like to focus on one part at a time...but i'm pretty lazy.
Also have just bought NYC ballet dvd, the ballet dancers bodies are such an inspiration, they are so so beautiful!