I bought a white Sony PRS-T1 recently. The case is the same white as Jetbook. You know what? Sony PRS-T1 background (pearl) seems more gray than PRS 650 (same pearl). Impossibile?!
Ok I compared the two reader face-to-face and I noticed that (obviously) the background are the same: seeing PRS-T1 screen alone seems gray only because of the too white chassis.
I'm not saying Jetbook Color is as white as Sony PRS-650 or T1 (I spent a lot of word about pearl vs triton) but certainly you will agree that the glow-white doesn't help.
Anyway Andyh, have you developed your idea of to use the "atompub feature" to browse (for example) a book from calibre library?