From MSNBC:U.S. clamps down on banking transactions; terror group finds new funding
Seven years after the Sept. 11 attacks, U.S. intelligence officials believe they've won many small victories against al-Qaida's ability to finance its operations, but they remain unable to put a concrete dollar figure on their impact.
That's because they have no reliable estimate of al-Qaida's overall budget, according to current and former U.S. counterterrorism officials, which means the only measures of the organization's economic health are sporadic, anecdotal and fragmentary.
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My Comment: A fascinating article. In summary .... it does not take much money to cause an incredible amount of damage.