Via the New Security Beat, I cam across this excellent video from the Stimson Center about the implications of building new dams across the Mekong River.
Survival: Mekong Dams and the Perils of Peace (sub. required). While the video focuses more on the implications of the dams for fisheries, the aticle focuses on the debates between the nations that share the Mekong. There is an important climate component to this as well. Although the river is not dependent upon glacial melt for the majority of its flow (6% according to the WWF), during the dry season, this glacial runoff is important.