RAND has just released a report on ballistic missile countermeasure technologies.  The Report: “Penaid Nonproliferation: Hindering the Spread of Countermeasures Against Ballistic Missile Defenses” by Richard H Speier, K. Scott McMahon, and George Macouziis is primarily about using the Missile Technology Control Regime to attempt to limit the spread of countermeasures technology, it also has a number of interesting figures illustrating countermeasures approaches. The Report is available at: http://www.rand.org/pubs/research_reports/RR378.html.