Because I'm on them.
Matt at You Ain't No Picasso asked me to make a mix for his 12 Days of Mixmas series. I was happy to oblige. YANP is a great blog that tracks the current musical taste of one Matt Jordan. He's got other Mixmas entries this year from our pals Fishboy and lots of others.
This is the second year in a row I've been allowed to make a Mixmas for YANP. You can read my '06 entry here, though the mp3 links are dead.