Well, sticking with feasible changes that could be made to the firmware only (since obviously you can't change the hardware-- and new hardware with new features would no longer be a 300 but a new model) I'd love to see the 300 be updated to directly all available ebook formats and HTML. And the ability to directly read .CBR/.CBZ files. And to auto-crop PDF margins (like, I believe, the 900 can do.)
|