"If you're looking for fantastic holiday music, iTunes has you covered with this collection of 20 holiday tracks, from bluegrass versions of traditional favorites to R&B takes on Yuletide hymns. Featuring artists like Weezer, David Archuleta, and Aretha Franklin, this collection is a great way to soundtrack your holiday. It's also a great way to explore the glory of iTunes LP — you can browse photos, check out lyrics, and read more about the artists. All of this, and it's absolutely free for just one week." -- iTunes Store
Download for Free!
Big thanks to Chris in the comments for the tip.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.