Update: I really enjoyed Kathy Kitzis / A Mother's Touch Calmbirth class. It's a bit light on the hard content, but Kathy more than made up for that in the expertise and experiences she shared. I also liked that they had a weekend option and a 5 week class course. In the end, we decided on the 5 week course so we'd have more time to digest the info and ask questions.
In the class, you'll get some directions on breathing and meditation-like exercises. I didn't really like the CD that came with the book, but I recorded Kathy reading the exercises and used those to practice at home.
I found the breathing definitely was important during the natural, unmedicated hours of my delivery as was Kathy's invaluable help as my doula (see "Doula Recommendation" post for details). Overall, I realized the class helped me change my perspective on birth from one of subconscious trepidation/fear to a more positive, even enthusiastic viewpoint about the birth process.
Also, after taking Calmbirth, I didn't feel like I needed another basics class, but I did read up on things in the "What to expect when expecting" book.