OK, on advice I downloaded the Advanced Task Killer app...but when I go on and kill apps, when I go back on again most of the apps have restarted.
I found that too. It does kill them but they just start up again straight away. Not sure if you need to change the settings on the app itself or the apps being killed, I just gave up on it and never used it.
Same as me mate, never understood it, then my son told me to use Juice defender and I must say that it does make quite a bit of difference to the battery life. I have mine set to agressive and it has doubled the battery life!!