My colleague Amos Guiora has this interesting article on ways to improve international cooperation against terrorism. Here's an abstract:

Terrorism against the United States, post-9/11, reaches far beyond the U.S. borders. In order to effectively prevent and react to terrorism within the homeland, the U.S. must think of security internationally. International security efforts touch on key issues such as travel security, border control, immigration, intelligence, and financing terrorism. This article examines the U.S. effort at international cooperation in homeland security by examining security and threat assessment in order to analyze current developments and necessary progress moving forward. Further, this article explores comparative efforts at international cooperation in homeland security by examining Canada, Japan, and the E.U. in terms of security and threat assessment. Finally, this article offers recommendations and articulates criteria by which the U.S. can improve vital efforts at international cooperation in homeland security.