what's the best way to learn a foreign language? | warrior ... - the best japanese skin care products

I recently heard a commercial advertisement about the Rosetta Stone ---
A foreign language software is said to be used in the United States. S. Army.
Anyway, it makes me think: what is the best way to learn a foreign language?
Does anyone know a good tool to do this?
(Also, it would be great if you could avoid your "move to a foreign country" response ).