Nice three pages of information, thanks to all contributors so far.
I am also looking for a nice eInk tablet or Android eReader, but with the additional constraint of supporting mobile data (e.g. 3G or 4G in addition to WLAN aka Wi-Fi)
I have looked at the mentioned Onyx and Icarus devices, but as far as I can see, these only have WLAN, not mobile data.
Basically, I am looking for a device that allows (a) reading EPub (with and without Adobe-DRM) as main function, (b) has a usable PDF viewer, preferably with note-taking, (c) sent/receive text messages (SMS) and (d) as big plus allow installing of (Android) Apps for networked calendaring (CalDAV), addressbook (CardDAV) and other things. An "open" system with regular updates and third-party Apps / available SDK is a big plus.
Does such a thing exists?
I once had (and still own) a PocketBook 603, which has Wi-Fi and mobile data.
Unfortunately it doesn't run Android and the mobile data modem isn't accessible. And it's quite old and long out of updates. EPubs still work, still one of the best free-hand notes App I have seen so far. But its browser doesn't deal well with modern websites and the battery is slowly giving up.
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Just realized: 1st post since nearly five years (Feb 4th, 2012) -- man does time run fast!)