What provisions does the iPhone make to save battery, when the level drops?

When I get the warning about my battery dropping under 20%, does the iPhone actually make smart provisions to keep it going for as long as possible?
For example by reducing screen brightness, stopping push email, email checks, killing background activity and scaling other services.
If it does not already do this by default, and option for this to happen would be a welcome edition to eek out as much "emergency use" as possible.

No, it just warns you. It's then up to you to take steps you deem appropriate to conserve your power, or connect to a power source.
Steps to conserve power can be found here:
http://www.apple.com/batteries/iphone.html

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