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I think that every author/publisher who's committed to offering DRM-free books via 3rd-party outlets should state that explicitly in their product descriptions (after purchasing and downloading a copy to make sure it really is DRM-free from that site), because not everyone will know enough to know even about Amazon's code-phrase for "this book has no DRM but we're not going to admit it openly".
@ Jasonofindy
The list is looking good. If I may make a suggestion, maybe it would be more convenient in the final version to list the formats and their DRMs first and supporting devices, and then have a list of which stores support what format/DRM with the major stores placed first. That way, there might be less duplication of stuff that was already said about another store which supports the exact same formats as a previous one.
Also, I should note that while Amazon bought and owns the Mobipocket format, there are at least two different kinds of Mobipocket DRM that people are likely to run into.
One is the Amazon Kindle Mobipocket DRM which only works on Kindle and apps. The other is the older-style Secure Mobipocket DRM which is used by Overdrive library books and occasionally still sold through 3rd party vendors. The latter cannot be read on a Kindle without the use of scripts to tweak the file, because Amazon has not incorporated built-in support for the older DRM scheme.
They've also a second DRM format called Topaz, which everyone dreads because it's buggy and unstable. But it only works on Kindles so it's a moot point unless people are looking for non-Topaz versions of the books, in which case a book which is Topaz at Amazon can often be found in ePub at another outlet.
You can tell whether or not a book is Topaz by again looking at the Product Details. If it has a "Print Length" only with no "File Size" listed, then it's Topaz.
And Kobo is starting to offer ADE-DRM PDFs (mostly for academic titles). They had a banner about it on their website last month.
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