IQ is the measurement of cognitive intelligence.

EQ is the measurement of emotional intelligence.

CQ is Cultural Intelligence, an individual capability that can be measured and enhanced, aiding in our ability to interact cross-culturally.

For more information, check out the The Cultural Intelligence Center website.  

Cross-Cultural Ministry Books: 

Expand Your Borders by David Livermore
Learning to Listen, Learning to teach by Jane Vella  
Foreign to Familiar by Sarah Lanier
Cultural Intelligence by David Livermore
Ministering cross-culturally by Sherwood G Lingenfelter

Helpful websites:

Cultural Values comparison by country: http://geert-hofstede.com/countries.html
Cultural Intelligence Blog:
 http://davidlivermore.com/blog/
Missions Magazine:
 http://www.missionfrontiers.org/
Missions Blog:
 http://www.brigada.org/
Worldview Articles—Chuck Colson:
 http://www.colsoncenter.org/journal
Randy Alcorn Online Resources:
 http://www.epm.org/resources/  
Emmaus Road International: Missions Resources:
 http://www.eri.org/