Cory Doctorow has posted a talk on DRM that he gave to Microsoft. Its very entertaining and well-crafted. He argues effectively:

1. That DRM systems don't work
2. That DRM systems are bad for society
3. That DRM systems are bad for business
4. That DRM systems are bad for artists
5. That DRM is a bad business-move for MSFT

If you've ever read any of Cory's books you know that he can really entertain and this piece is no different.