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Sharp memory LCD. It uses a simple SPI interface, can refresh at about 30fps, but has no greyscale unfortunately.

30 fps is pretty good for an eInk screen, and UI design for a two-tone black or white screen seems like a really interesting challenge.

Maybe I should build one of these...

Ill be doing a small run of prototypes in about a month. Could assemble one for you if you want to hack on it.