The panasonic SigmaBook uses Cholesteric LCD. It's just a monochrome LCD display that retains it contents while is powered off.
So it has the power saving fetures of e-ink, but lacks its contrast and "paperlikeness". It's the same technology as the one referenced in
Not as interesting as the Jinke V2/V8, Sony Reader or the iRex...
By the way, this is my first post in Mobileread. Hi all :-).