Free Tegan and Sara single at iTunes
iTunes Music Store has always had free downloads, but never has it been for an artists that I cared about, or even heard of (though I guess that's the point - it's free so people would try it). But right now, you can get Tegan and Sara's current single, Walking With A Ghost (link opens in iTunes) for nyada.
You have to set up a Music Store account if you haven't already, and like all the 99 cent singles there, it only plays on iTunes on up to 5 PCs or an iPod. Still, it's free.