The Amazon.com mp3 music store just got more awesomer. Warner agreed to allow them to sell their music DRM-free, so now old Led Zeppelin, Smashing Pumpkins, and Radiohead albums (among others) are available for purchase as high quality mp3s with no restrictions. The last of the four big music conglomerates, Sony, is also considering selling DRM-free tracks through Amazon.com. Take that, iTunes!