Since this is my first post at KnittingHelp, I can't post the link. :(
So, I'll copy-and-paste the directions.
"Flat 3-needle bind off
With wrong sides facing, hold both pieces in left hand. Using third needle in right hand, knit together first stitch of each needle, bring wool forward, purl together next stitch of each needle, lift first st on right needle over second and off. Take yarn back and continue alternating knit and purl sts while casting off.
This cast off (bind off) is fairly elastic so ideal for this project."
You can find the whole page if you paste this into your browser's address bar: users.netaccess.co.nz/major/gallery/tonishawl/tonishawl.htm
Hope this helps someone!