The Kindle and Sony devices have extremely good dictionaries of both British and American English; the nook has an extremely poor dictionary. I'm not aware of any other devices with built-in dictionaries.
Pocketbook and BeBook Neo/Onyx Boox 60 devices have an interface for a dictionary, but no dictionary is supplied with the device. With those you're basically stuck with using public domain dictionaries. I understand that Pocketbook either are, or will be, making a range of commercial dictionaries available, but you'll have to buy them.
The Bookeen CyBook devices can use commercial Mobipocket dictionaries, provided that the device is used with the Mobipocket, rather than ePub, firmware.
All the dictionary interface work well.
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