We've begun work on the Short Guide to Living a DRM-Free Existence. It includes online music stores, producers of eBooks, and portable music players that respect the rights of the user. They give you the freedom to enjoy the media you own on the devices you own, without worrying about whether the latest album you bought will be compliant with a particular flavor of Digital Restrictions Management.
So check out the guide now, and let us know if you have other resources you would like to add.