IOS4 upgrade - details on changes

I am looking for a site or document that explains all the updated functionality that comes with IOS4. I found the user guide, but that is specific to the new hardware as well. I want something that describes the functionality that comes with an upgrade to a 3GS phone.

A) Cover the camera and take a black picture - that is the solution I have heard of
B) The phone will automatically close programs that have been in the background for a while and have not be used if resources are needed. Should be no need to worry about shutting things down all the way any more.
C) Remove your pictures from your phone and re-sync. That has been reported to clear up blurry pictures.

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