Entropy:

Two guesses that might be profitable:

1) I'd take a look at the Political Instability Task Force website (http://globalpolicy.gmu.edu/pitf/).

2) I'd also look at Barbara Harff and Ted Robert Gurr's websites: Minorities at Risk (http://www.cidcm.umd.edu/mar/bio.asp?id=2) and Polity IV (http://www.systemicpeace.org/polity/polity4.htm).

Two more likely successes:

3) David Laitin and James Fearon have a compilation at the end of their article in the February 2003 issue of the American Political Science Review, "Ethnicity, Insurgency, and Civil War." It won't be tabulated since it's in text, but it should be easy enough to input the data (<1 hour).

4) Last, a compilation of asymmetric wars (although not necessarily insurgencies) can be found, I think, in Ivan Arreguin-Toft's "How the Weak Win Wars." The same disclaimer about tabulation applies.

Thanks
Jeff