Doc Searls points to a cdfreak.com posting “…one feature that has a drastic affect [sic] on battery life is the infamous DRM.” Their link to a ZDNet review is broken, but it’s no surprise that asking a poor little battery-operated thing to decrypt sound as well as decompress it is going to be more costly in terms of power. So, DRM supports the energy cartel. No surprise there, eh?
Send the message with your wallet. Buy unencrypted music and rip it for yourself in your choice of formats and your choice of sampling rates for your choice of playback devices: home, car, player, whatever. It’s about choice.