ArsTechnica reports that Amazon is poised to launch a digital download store selling MP3 tracks free of DRM. The Amazon store will feature EMI's catalog and may also offer Universal's classical catalog. The latter offering would be a huge development for DRM free digital downloads. Universal is the largest of the big 4 labels, and even a partial opening up of their catalog for digital download without DRM would point towards the end of DRM on all music downloads.
BoingBoing also covered the story and it still seems like there is some uncertainty about what exactly Amazon will be offering (with regard to Universal's catalog).
Stay tuned for an upcoming action announcement tomorrow.