Sounds nice, but that sort of useability surely has more to do with the "closedness" of the readers' firmware than whether or not epub dictionaries are available. On my PRS-900 I have two dictionaries. One American English and one Oxford dictionary. I have no idea what format they're in as they're buried in the firmware, but surely, if they (Sony et al) wanted to, we could install our own dictionaries in the appropriate format. For all I know, the inbuilt ones might actually be epub, although they're placed under "apps" on my reader.
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