I own a couple, but only do them once in a while. My exercise is usually chasing a two year-old, going for long walks, and swimming.
Yoga for Dummies is fun. It's very slow, basic moves. I enjoy that one, but, I have to have time alone to do it (can't concentrate with "mommy! mommy!" in my ear), so I don't do it often.
I also have one of the Walk Away the Pounds videos. It's ok, but, I'd rather be walking outside.
Probably the best video I ever had (and lost when we moved last fall!) was an old Richard Simmons video.
I know, I know.... you're all thinking I'm nuts now... but, it was fun. It was Sweating to the Oldies or something like that, and it was a fast paced workout. Richard Simmons cracks me up, but I find him motivating. Whatever works, right?