Let's face it. If you were going to get started on a Christmas sweater, now's the time to cast on! If you aren't already familiar with Elizabeth Zimmermann's Knitter's Almanac, you should grab a copy and read it. It's a fun read, even before you get to the patterns. For December, she features something she calls the "Hurry-Up Last-Minute Sweater." Knitted in chunky wool, it'll go quickly, and with EZ to guide you, it'll fit perfectly.
For some very attractive pictures of finished sweaters, and ideas for yarn, check out the Ravelry project page. We have some gorgeous new chunky wools - thick and thin, braided, striped, and heathered - all of which would make an extremely attractive sweater.