Well, on the older ibooks when you switch out your battery, you can simply close the lid, let the machine go into sleep mode, remove the battery and quickly put one back in. Open you finished you can open the lid and the computer will wake back up because there's an additional battery inside the machine.

Not sure if they do that in the newer macbooks.

The great value of steam, and audible and other services that uses DRM is the convenience of not having to keep my own copy. If I bought a new computer, I can just download the games / audiobooks that I'd purchased off their server.

Itunes isn't quite there yet. Sure you can downlaod the iphone applications from their server again, but once you'd downloaded music / movies from them, you're on your own. Better make sure you have backups.

DRM is ok if it's weak and non-demanding. being able to play it on multiple number of PCs and devices should make it a fine compromise.