Samsung tablets have their own proprietary connector, with an adapter to USB. It won't work with the ThinkPenguin wifi device: it needs 300 mA of current (or more?), while the tablet provides only 100 mA (200 mA with custom kernel). Maybe it would with a powered USB hub (unportable) and appropriate software changes to have the driver and free firmware for it.
Some people use old Hanlin v3 ebook readers which work with OpenInkpot without nonfree software. Now the hardware is not available and the project stopped development. I don't know how hard it would be to replace all software used on a newer eink reader, no one does it.
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