Which of the recent Wikileaks documents are (a) most embarassing and (b) potentially very dangerous?

The United States diplomatic cables leak began in late November 2010 when the whistleblowing website WikiLeaks and five major newspapers published a cache of confidential documents that detail correspondence between the U.S. State Department and U.S. embassies around the world.

The first 200 of the 251,287 documents were published on 28 November by WikiLeaks, El País (Spain), Le Monde (France), Der Spiegel (Germany), The Guardian (United Kingdom), and The New York Times (United States). Over 130,000 of the documents are unclassified and none of the documents are classified as “top secret”; some 100,000 are labeled “confidential” on the classification scale and some 15,000 documents are at the higher level “secret”.

http://en.wikipedia.org/wiki/United_States_diplomatic_cables_leak#Contents_by_region

Many of the 251,287 documents are relatively harmless, while others are not. Which ones are most embarrassing? Which ones have the potential to create real dangers with people getting hurt or even killed?