Ms BobbleFrog -- it totally ROCKS that you mentioned the MD aspect because surgery generally won't cure general back pain. It IS indicated for some, but MAN the chances of getting "cured" through surgery is a crapshoot at best. I was just trying to support what you were saying!!
As for yoga postures ---
I am really new to Yoga and I do Bikram's Yoga, which has a specific series designed for spine strengthening mixed with poses that work your front side, in particular the balancing poses. Here is a link to the poses as Bikram's Yoga teaches:
http://4.bp.blogspot.com/_EMAAahcNpn...kram+poses.bmp
Bikram's doesn't do any inverted poses (i.e. downward facing dog) and for THAT I am IMMENSELY grateful. Being somewhat - ahem - chesty, these inverted poses are AGONIZING for my wrists and shoulders (OK, strap those two watermelons on your chest, then balance all that weight forward on your inflexible wrists...arghhh!!).
I also found this online -- a free, 1 week back pain yoga course from about.com that will give you a sequence specific for back pain that you can do at home:
http://backandneck.about.com/c/ec/107.htm
and I think if you are interested, just check out a yoga place and ask some questions. And make sure it is a yoga place OR if at a health club, that the instructor is a certified yoga instructor vice the holder of a weekend seminar-type credential (you'd be surprised how many fitness clubs offer yoga and pilates taught by instructors who have taken say a 3 day "course" at the YMCA...). Not that all health club yoga instructors aren't yoga-qualified. Just make sure of the credentials, that's all!
Kira