XMDF has viewers for Windows, PocketPC and Palm. dotBook viewers are available for Windows, Mac, PocketPC and Palm. The only dedicated reader (that I know of) that supported those two formats was the now-out-of-production Words Gear.
So, unless you're interested in only classics from Aozora Bunko (those can be converted and read on almost any device), right now I don't think there exists a dedicated reader that is useful for Japanese ebooks.
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