With Phnom Pehn having the river Mekong and Tonle Sap river, plus an airport, plus buses and coaches there are lots of travel options, sadly my mate who was buying the blocks of ice for his glacier water from the fjords of Cambodia didn't get any pictures of how to get to Thailand, anyway he flew from Bangkok to Phnom Penh then got a flight to Saigon I believe, he also got robbed in Phnom Penh and had his camera stolen, funny how these old guys fall for the 4 birds fondleing you whilst one of them goes through your pockets, anyway he went back to phnom Penh to take some more pictures for me.
Anyway first up is Blue Cruiser, Phnom Penh to Chau Doc, high speed boat leaving at 1.30pm everyday. 016 868887
93EO Prah Sisowath Street,
Sangkat Wath Phnom.
Friendship Passenger Boat goes from Phnom Penh to Kratie or Siem Reap, 011 876 555
Mekong Express Limousine Bus does Phnom Penh to Siem Reap, Sihanouk and Ho Chi Minh, 012 787 839
Phnom Penh to Chau Doc at $21 by Hang Chau Express Boat twice a day, 012 93 23 46
You can view a map of Cambodia and a map of Phnom Penh here.