This was my first trip to Cambodia.   Some highlights of the trip were (in no particular
order) --

1. Regarding the 4 countries that I visited during the 3 week period, the ones from
   poorest to richest were Cambodia, Vietnam, The Philippines, and Thailand.
2. To enter the country, it is necessary to have a visa ($20).   To leave, it is necessary to
   pay a "departure fee" ($11).
3. The currency is the "riel".   At that time, one U.S. dollar equaled approximately
   38,000 riel.
4. Coins are not used in Cambodia.   The bills include 50, 100, 200, 500, and 1000.  
   (There might be higher bills, but they aren't regularly used.)
5. It is dangerous to walk along local streets at night.   I met one man who was beaten
   and robbed and had just returned from taking his friend to the hospital.
6. If intending to visit Angkor Wat, you have 2 choices to get there.   You can either fly
   directly to Siem Reep or you can go to Phnom Penh and then travel to Siem Reep.
   I recommend using the first option because it is more difficult to get there from
   Phnom Penh.
7. The language is "Khmer", not Cambodian.
8. The most interesting things that I saw within the city were the Royal Palace and the
   Tuol Sleng Genocide Museum.