iOS 4 Memory + Battery Management using Backgrounder
iOS 4 seems to background absolutely everything. After checking Facebook, twitter, playing 5 minutes of bejewelled and 5 minutes of flick football, I lock the screen.
Using sbsettings and checking processes I can see that my memory is very low compared to before, and checking processes I can see that those 4 apps are still running.
Some apps like tomtom, spotify, last.fm are handy to be backgrounded but 90% of my apps I am happy to not be backgrounded.
Checking processes in sbsettings and killing every app I didn't want running becomes very tedious very quickly.
I remembered that backgrounder provides an override function.
Open Backgrounder, tap 'Override', add an app and then set it to 'Off' if you want it to fully quit when you press the home button and exit it.
This will keep your memory free, in turn extending your battery life - all without any time spent maintaining.