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WWICS Mexico Institute, 17 May 10:

Drug Trafficking Organizations in Central America: Transportistas, Mexican Cartels and Maras

Small Arms Survey, 30 May 09: Gangs of Central America: Causes, Costs, and Interventions

The authors have produced an unfocused, surface treatment of an important issue. The piece adds nothing to the discussion beyond what is already found in existing articles such as Are the Maras...

ICG, 14 Mar 08: Latin American Drugs I: Losing the Fight

Complete 42 page report at the link.

Edit to add: Latin American Drugs II: Improving Policy and Reducing Harm

SSI, 15 Jan 08: A Contemporary Challenge to State Sovereignty: Gangs and Other Illicit Transnational Criminal Organizations (TCOs) in Central America, El Salvador, Mexico, Jamaica, and Brazil.
...

CRS, 4 Dec 09: Gangs in Central America

Reuters, 18 Jul 07: U.S. Offers Funds to Fight Central America Gangs

DoS, 18 Jul 07: Combating Criminal Gangs from Central America and Mexico

...just for some additional background material on the subject, here are some decent gang assessments published by USAID last year:

Central America and Mexico Gang Assessment - Full Report April...

Military Review, Jul-Aug 07: The Maras: A Menace to the Americas