An elementary image demonstrating Quantum Entanglement process and effects. It's the ground work for a whole new area of science and technology....applications include quantum cryptography, communications and true parallel processing in a photonic CPU. In the CPU one or more photons are paired and then sent or threaded to seperate photonic CPU's to do the processing... one amongst many other applications..still a fair way away but excitng no doubt.
Read some more at the Wiki: http://en.wikipedia.org/wiki/Quantum_entanglement
Or at Stanford: http://plato.stanford.edu/entries/qt-entangle/
[Heavy reading, don't get bored thought :-)