method to determine battery usage by each APP?

I have 200 apps installed on my Galaxy Nexus. I've never had great battery life (like most of you).
I installed an APP called Juice which claims to optimize battery life, but I want to go a step further.
I'd like to be able to analyze how much power each APP or process uses in the background over the course of a day when my phone is either in sleep or active.
I couldn't find an Application that does this.
I have strong hunch that some apps sap more power than others with their background processes.
If someone knows a way to perform this kind of analysis, I would appreciate it

Have you tried going into settings>battery? It pretty much shows at the moment how much of battery is being used by which apps.

So obvious, can't believe I missed this. Thanks!

Also, one of the cool new features of ICS, if you goto settings/data usage you can see what each app is using and if you click on the app you can set how much data each one uses and turn off background data usage for it. I think the ICS system stuff will do everything you need without the need of another app to monitor stuff.

...sent from your local Nexus