So when youre travelig and unsure where the next TV or computer or other USB outlet will be you just switch to 2g network, switch screen brightness to lowest, cancel FB/twitter/RSS updates for feedscreen, etc.

Depending on necessity switch email sync off too.

That way you should have a good batterylife for your navigation and your familycalls.

But when youre at home or near a wallsocket or USBsocket you just plonk it all back on again.

There should be a settings app that you can configure for this, and make a profile called Work for instance with all these options changeable, that allows you to change from "Travel mode" to "Normal mode" with a single press... hm...