I like Ali McGraw Yoga Mind and Body, and right now I'm doing (and loving) Brian Kest's Power Yoga (and sadly, I've developed a crush on him, too - eek). I have Shiva Rea, but haven't done them yet.
I've seen the Namaste Yoga series, but I can't get over the borderline soft-pornish way it's filmed. Remember in the '80s, on cable, those workout girls that were filmed - they were on a white set and the video rotated and it was all very weird. That's how Namaste feels to me. It focus too much on the girls bodies and faces and flipping hair and stuff. Creap factor too high for me.