If Phone Idle is the highest percentage of use by your phone and you're not using it much, that is a good thing! Remember, these figures are PERCENTAGES. If you aren't using anything, then of course your phone being idle would be the highest percentage of battery use. However, if something else is the highest percentage, there may be something going on.
I think if your Android System is the highest percentage even though you aren't using your phone much, that must mean something is running in the background keeping your phone awake, like the Messager app (explained in the battery thread how to solve this issue). If you made that change, then there might be another app that is checking in a lot.
I may have to figure something out, because "Cell Standby" is my highest percentage of battery usage. I don't think it should be if that means my phone is attempting to find cell coverage or something. Anyone know what exactly the Cell standby means? When I press it, it tells me I have had 0% of the time without a signal.