An interesting snippet from the article:

Islamic ethics is based upon dualism. There is one set of rules for the Muslim and another set of rules for the kafir. Islamic ethical dualism extends to truth and deceit.

TRUTH
In Islam something that is not true is not always a lie.
Bukhari 3,49,857 Mohammed: "A man who brings peace to the people by making up good words or by saying nice things, though untrue, does not lie."

An oath by a Muslim is flexible.
Bukhari 8,78,618 Abu Bakr faithfully kept his oaths until Allah revealed to Mohammed the atonement for breaking them. Afterwards he said, "If I make a pledge and later discover a more worthy pledge, then I will take the better action and make amends for my earlier promise."

When deception advances Islam, the deception is not a sin.
Bukhari 5,59,369 Mohammed asked, "Who will kill Ka'b, the enemy of Allah and Moham-med?"
Bin Maslama rose and responded, "O Mohammed! Would it please you if I killed him?"
Mohammed answered, "Yes."
Bin Maslama then said, "Give me permission to deceive him with lies so that my plot will succeed."
Mohammed replied, "You may speak falsely to him."

A very controversial topic, but I'd like to hear your thoughts on it.