For public domain books, I use the MobileRead library.
For books that are out-of-print or that contain just a tiny bit of information needed for a research project, I check Google Books (the Kindle's web browser is compatible with the online Google Reader).
For books not available in the public domain and/or for when I'm in the mood for an impulse buy, I check Amazon. When I'm in the mood for sci-fi, I check Baen.
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