httpvhd://www.youtube.com/watch?v=fbPpeXP5GdE&
The folks at iFixyouri have put together a brief iPhone 4S teardown that shows you how to disassemble and repair your new smartphone. They also have a separate video that shows you how to replace the screen on the iPhone 4S.
iFixit recently did its own teardown of the 4S as well, and it was learned that the device has 512MB of RAM and a new 3G chipset (among other additions).
As 9to5Mac notes, you may want to have the mute switch ready when playing this video. Not sure what the makers were thinking with the song choice.
