Clarkesworld Magazine has wonderful metadata for their issues and anthologies that requires little work from me:
Tor books had an awesome DRM-free policy that I love and that allows me to go to the ebook vendor of my choice. And they give away a free book every month as long as you agree to get some marketing emails from them. But their metadata is not so great:
Come on, Tor! You publish Science Fiction! Let’s get some better metadata on those ebook files!