Find out about the components that a Raspberry Pi is made from in this Component Map.
This site is a map of virtually all components of raspberry pi(rev2) in a single image. 25 of them you can click and will open the datasheet, you can see values of all capacitors and resistors, some of components have some information.
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Is already useful to me and i hope you all enjoy raspmap.tsar.in
There is also a component map of the Arduino UNO on the same link.