one good way to make your battery last longer is to restart your ipod every so often, especially when you are going in and out between a lot of apps. when you open an app and close it, some of the processes are still running in the background. if you restart your ipod, it will close out all these processes. the more processes you have running, the slower your ipod will perform functions and the more stress on the processor and the more battery your ipod will use. I downloaded an app called FreeMemory and what it does is it tells you how many processes are running and how much free memory (processor memory, not disk memory) that you have free. If it gets below 20mb, then it will free up some of the processes. This app is not necessary if you restart your ipod every so often or actually completely close out of an application (hold down the home button for about 3 seconds when an app is open), but I use it a lot to get a better idea of what apps use what kind of memory. hope this helps.
