Peter Kornbluh, whose career is dedicated to declassifying U.S. documents related to Latin America, has an article in The Nation with an overview of Wikileaks and U.S. policy. He suggests that the documents may shed more light on Latin American than on Washington.
From the Cuba cables, as much can be ascertained about the thinking of Raul Castro’s government as about US policy toward it. This is true for the broader region as well. In Latin America, where declassification of records on internal government deliberations is severely limited, the WikiLeaks cables provide detailed information on official conversations, meetings, national security plans, social policies, foreign policies, economic policies and more.
Readers in Argentina, for example, can track the debate within Cristina Kirchner’s administration on decriminalizing the use of marijuana. Hondurans can listen in as those generals and politicians who overthrew Zelaya plotted to consolidate their post-coup powers. Chileans can better understand how their government alters building codes on the construction of thermonuclear plants at the behest of foreign corporations.
It's an interesting point. We rightly criticize the U.S. government for keeping things classified (did you know, by the way, that the Department of Defense will not reveal the biggest threat faced by the U.S. in 1975?) and organizations like the National Security Archive fight to declassify them. But more attention should be paid to the fact that Latin American governments hold on even more tightly.
Plus, given the history of repression, scolars and activists alike tend to focus on the documents of military regimes rather than more recent democratic governments, who nonetheless have plenty of dirty secrets.