I have been wanting to try my hand at this binding for a while now. I've seen this called a few different names;keyhole binding,buttonhole binding,and exposed long stitch binding so I'm not sure what the actual official name for it is:
I used a metallic novelty thread to sew the signatures in on this one and it really glimmers against the black book cloth. If you're interested in trying this binding technique check out the free tutorial on making on over at the Cailun.info blog.
And speaking of books,check out the beautiful fabric covered hardcover padfolio that Cynthia made!