Thank you for a nice set of power tips. However, it is a bit inconsistant and biased.

You can save even more power by leaving the GPS and cellular radios off except when you need them. Conversely, wifi is also optimized to conserve power when it is not being used. I leave wifi on all the time without problem. I have not put a SIM card in yet because I have not yet found a way to have the cellular radio off and the wifi on.

Please do not assume that every n900 user needs to have the phone part on all the time. Also, the cellular radio is a far larger power hog than wifi. It is not necessarily a battery life problem to leave the wifi on 24/7 and I suspect leaving GPS off except when needed
would give longer battery life.