STR has got to be the yummiest sock yarn ever! I was turned on to it by a sock list that I belong to. I have heard raves about how stretchy and easy to knit it is. You can find the yarn itself here: http://www.handspinning.com/thefold/yarn.blue.html
The main site for The Fold is here: http://www.handspinning.com/thefold
I got the last hank of 'Azure Malachite' and 'Romancing the Stone' that Toni had. There is supposed to be enough in one hank to make an adult pair of socks, and I'm trying sooooo hard not to find out yet. This is the best SEX ever!
Looking at the yarn itself, it seems to have a very tight twist on it which would explain the "springiness" I've heard other knitters mention when working with it. I know from crocheting with threads that were highly twisted, that I had problems with it kinking up on itself from the twisting. I also know that it makes for no problems with splitting, and it's nothing that letting my work hang and uncurl won't fix. I will be sure to let you all know as soon as I have it wound and cast on... which at this rate might be tonight... hubby might have to understand that, "no dear, we can't go play pool tonight, I have STR to use!!!"