I luve my BB playbook
... which is not even mentioned here. I have read several hundred sites of different ebooks, in bed, on train and elsewhere, used the DocumentsToGo for IT device inventory, have my favorite movie clips on it etc. etc.
The thing is still not mature, as the Android app compatibility is nothing to boast about, but experiences seem to differ.
And if you *really* wish to stand out of the masses - use one of them Symbian Nokia touchphones with Albite Reader ;-)