I thought I'd start a new thread to clarify that not all thefts lead to the punishment of amputation.
http://www.islamic-study.org/Islamic%20Penal%20Law.htm
According to Islamic law, the maximum penalty for professional theft is cutting hands. It should be understood that this policy does not mean that for every theft there is a hand to be cut. The judge exercises other forms of penalties such as imprisonments or fines. With the mere existence of the hand-cutting rule, however, theft in Muslim societies never grew to the level of proficiency and organized crime. The effect of severity of hand cutting as a punishment for theft, and the shameful impact on someone with his hand cut has almost completely eliminated this social disease in the Muslim societies.
An article on Islamic law - Myths and Realities:
http://muslim-canada.org/Islam_myths.htm
..
Some in the media only mention that if you steal, your hand is cut off. The Islamic judge must look at a higher level of proof and reasons why the person committed the crime. A judge can only impose the Hadd punishment when a person confesses to the crime or there are enough witnesses to the crime. The usual number of witnesses is two, but in the case of adultery four witnesses are required. The media often leaves the public with the impression that all are punished with flimsy evidence or limited proof.
(Note that the authors believe Apostacy is a crime and make a reference to 'liberal' judges not viewing it as a crime - I have a separate thread on the subject of apostacy - but here we are talking about the punishment for theft, which they cover well.)
Cheers,
Shafique