Google just announced that they’re making a million+ public-domain books downloadable in EPUB format. This is an improvement over the old situation, where you could download PDFs (sans OCRed text) of those books or read them in plain text online (one physical page at a time), but not download a small, well-OCRed text copy.
I’d be delighted if they went all the way to true plain text downloads. (And then let me download all the public-domain stuff in bulk. And gave me a pony.) But this is a nice improvement. In other news, I’d also be delighted if my Kindle supported EPUB natively.