Auto-Brightness and Multitasking

Hi,
Auto Brightness does not seem to do anything? With the setting both off or on, the brightness stays constantly at the single setting chosen on the slider. Where is the ambient light sensor on the 4th gen, and does it even do anything?
Also, multitasking doesnt seem to be efficient. Every program that is exited via using the home key remains in the task manager (double tap home). This seems like a pain as the user has to manually exit each program via this menu?
Thanks for any comments.

It is NOT a multi task bar. It is a recently used apps bar.
All of those apps are NOT running, they have been recently used. You do not need to close them, as most apps do not run in the background.
http://whenwillapple.com/blog/2010/04/19/iphone-os-4-multitasking-explained-agai n/

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Auto-Brightness and Multitasking

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