I strongly recommend having your favorite pattern books spiral-bound.
Most of the craft books (knitting, twining, and quilting) are soft bound.The books aren't too practical when I need to actually use them. Often the binding becomes broken from my attempts or it slips all over the table or off of my lap.
Once I discovered that I could have the books spiral-bound at Kinkos, my books are in better shape and I am much happier.
Personally, I wish publishers would produce these books with spiral bindings.