Terrorist Finance (merged thread)

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Terrorist Precursor Crimes: Issues and Options for Congress. CRS, May 24, 2007. (PDF)

Congressional Research Service reports are excellent primers on issues, and for undergrad homework. Most can be found at FAS. Google Scholar and Google News Archives (example) are also invaluable tools for basic undergrad research.

One of the more lucrative illicit schemes in the US for by terrorist financing groups involves tax fraud through tobacco smuggling, see:
Tobacco and Terror: How Cigarette Smuggling is Funding our Enemies Abroad, Prepared by the Republican Staff of the U.S. House Committee on Homeland Security. (PDF)