Iron - remember, I said twisting stretches. Like this: http://www.abc-of-yoga.com/yogapractice/sage.asp
or this:
http://www.yahooyoga.com/yyh1d01.htm
Doesn’t have much to do with hamstring flexibility.
BTW, you would want to try some milder variation of the above exercises. A great book is the “complete Illustrated book of Yoga,” just go to Borders and find a Yoga that features a real Swami and leaf through the twisting poses section.
Originally posted by fa_jing
Iron - remember, I said twisting stretches.
Remember, I can’t read. 
I’m looking through those links now.
Originally posted by IronFist
As for yoga stretching, I would wager that I’m more flexible than 99% of people here. When I’m not injured, I can bend down and put my face on my knees/shins while keeping my legs straight. The only thing I can’t really do is the splits, altho I can get close. The point is, my back is pretty flexible.
Actually, what you describe is more a function of flexible hamstrings than back, but that’s kinda beside the point.
strangely enough I think you’re right. but splits and thigh and hip flexibilty is another thing altogether. try some pilates for in depth body awareness… have you before Iron??