Well, this is more from a technical angle and my own personal curiousity, how about we do a discussion on how to technically do proper battery-life-saving, memory-saving multitasking on Linux?

There's a couple of interesting topics:
* WiFi traffic activity of background applications
* Radio wakeup for GPRS/3G communication
* SIGSTOP of background applications while you're touching the device
* Cgroups and ways to 'freeze' or limit background applications
* Application design to be better power consumers when backgrounded
* Hibernation of state

.. go!