Arduino Uno Quick Start Manual page 265

Shifting operations might seem intuitive, but you have to be careful when
shifting signed values.
the same as Boolean operators. Boolean operators such as && and || don t
operate on the bit level. They implement the rules of Boolean algebra.
Beginners are often afraid of bit operations, but there s no reason to fear
them. Microcontrollers operate on a bit level, so you have to be able to make
the bits obey your will. It takes some training, but it s not rocket science.
2. http://en.wikipedia.org/wiki/Arithmetic_shift
3. http://en.wikipedia.org/wiki/Boolean_algebra_%28logic%29
Appendix 2. Advanced Arduino Programming
2
Although they look similar, binary operators aren t
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