- Netbooks are usually based on Atom processors that are cheap when compared to Core2 and other more traditional PC processors but are much more expensive than the cellphone-class ARM processor used in the Kindle
- Netbooks use higher-capacity batteries because Atom processors use more juice than the ARM in the Kindle.
- The Kindle uses far more commoditized components than a netbook does - it uses cellphone-class components while netbooks use PC-class ones.
- Netbooks also have more RAM - the Kindle certainly has less than a gigabyte of RAM - I would risk the Kindle has no more than 128 megs, soldered on the motherboard - which is also cheaper than mounting RAM into a socket.
- The e-ink displays are not new technology - a couple years ago my carrier (in Brazil) offered me a Motorola phone with e-ink display. It was an entry-level "dumbphone" and I did not need one. The only "new" thing in the Kindle DX display is its size and design considerations that follow from it.