Slate has a nice package of stories about Mexico.
One piece examines why the drug war is spiraling out of control:
The Mexican drug cartels have been prospering for decades. This is not a problem that appeared overnight, as some of the more sensationalist media accounts in the United States might suggest, nor is it an issue that threatens to topple or destabilize the Mexican state. But by confronting all the cartels directly, simultaneously, and stridently, Calderón has managed to ratchet up the mayhem, particularly the violence against public officials and innocent bystanders who were drawn into what had previously been spasms of mostly intramural violence among cartels fighting for market share.