I wouldn't mind to hear a real life example of lower cost due thru modularization. It seems to me that modularization comes with A LOT of hidden costs, and they'd all have to be born by the customers in the end.

re:battery

Apple is making an interesting trade off.. whether it'll pan out as good as they plan remains to be seen. They've had some exploding ipods under their belt, afterall.

Pros\Cons?

+ More space efficient (can fit more of them in the device = longer batter life)
+ Lighter (?)
+ Higher rated lifecycle (?)
- Non user replaceable
- 'Sells' replacement battery and services associated with it below their normal profit margin to ease public concerns. (?)