Hi,
I really like Dr. Christine Anderson's Dynamic Prenatal Yoga DVD (do a search on the above words, and you can find the web site). I teach prenatal yoga, and Dr. Chris's DVD is quite a step or two up from the class that I teach (but I have all beginners too in my class). What I like about this video is that it has different levels of modifications based on the different trimesters, and some of those ladies in the tape, are doing what I would consider little modifications....even though they are in the 3rd trimester. It is really amazing that we can really take it up a notch or two, even in our third trimester. (But don't worry, there are others who are doing other types of modifications, in their 3rd trimester.) I really enjoyed the relaxation in this dvd also. Dr. Chris is a chiropracter too, and a long time yoga practioner and teacher. (75 minutes long if you include both the intro breathing section, and the relaxation section).
On the other end of the spectrum, I like the Shiva Rhea Prenatal Yoga video also. Plus, I like the YogaFit Prenatal tape, for all the different poses. This tape is about 45 minutes long.
Hope this helps!
Gaileee, RYT (and also 4 months along)