Official US Government site from 2009:
http://travel.state.gov/travel/cis_p.../cis_1134.html
Excerpts:
The Haitian government requires foreigners to pay a departure fee.
CRIME: There are no "safe” areas in Haiti. There is a persistent danger of violent crime, which can be subject to periodic surges sometimes not obviously explained by other events or conditions. Haiti is among the four most important countries for drug transit to the United States. Law and order in Haiti has steadily deteriorated as a result. Kidnapping, death threats, murders, drug-related shootouts, armed robberies, home break-ins and car-jacking are common in Haiti. Generally, these crimes are committed by Haitians against other Haitians, although several foreigners and U.S. citizens have been victimized. The incidence of kidnapping in Haiti has diminished from its peak in 2006 when 60 U.S, citizens were reported kidnapped. In 2008, there were 27 reported kidnappings of U.S. citizens, and as of September 2009, one U.S. citizen had been reported kidnapped. Many U.S. citizens who were kidnapped reported being beaten and/or raped by their hostage takers. Kidnapping remains the most critical security concern. Kidnappers have frequently targeted children.