Is that the "Flip-Over" cover? Can it be folded back to be out of the way when holding the device?
I always use HarryT's
Dickens, Charles: A Tale of Two Cities to test MOBI (no PID required). Screenshots from the iLiad
here. Can the DR1000S switch fonts for MOBI ebooks, and how does it compare to the Cybook (which has a better MOBI reader implementation than the iLiad at least)?