At this point, with 11 days until Christmas, you may have decided it's just too late to knit something for a knitter in your life, but they're still on your list. Now what? You probably don't want to give a Random Act of Yarn (a skein of yarn you think is pretty and have no idea what your knitter will do with it.) And needles? With so many kinds in so many sizes , circs, dpns, short straights, long straights... well, it can be hard to feel good about that, too.
Here's the thing: you're thoughtful enough to want to get it right, and yet don't know what that particular knitter dreams of at night. These books would be welcomed by most knitters I've every met. Try them for your favorite knitter, or leave this list out for folks who are shopping for you!
Any of the Knitting on the Edge (Over the edge, Beyond the edge, etc.) by Nikki Epstein books are a great inspiration and addition, even if your knitter is still diligently knitting their first scarf. Specifically containing only edge treatments, each offers a plethora of "spice it up" ideas with complete pattern instructions.
Stitch dictionaries are also very handy and popular. Try any of these: The Encyclopedia of Knitting by Stanfield and Griffiths has explanations of how and why certain techniques are used, as well as abundant photos and directions. Knit and Purl by Erika Knight covers hundreds of beautiful designs you can make with just the two most basic knitting stitches - an excellent reminder for those of us who over complicate everything. Knitting Stitches Visual Encyclopedia by Sharon Turner is just that - an easy to understand visual index of knitting stitches.
For the knitter who has everything, try the latest in the Vogue Knitting Stitchionary series, Stitchionary 6: Edgings. As this series goes on, it becomes more addictive. Have a big budget? Collect several of the titles above for your favorite knitter. They'll swoon in delight!