While this news is probably not applicable to 99% of this thread visitors, just an info - Vietnam just jacked up visa fees for US citizens - now cheapest Vietnam visa is US $180 via VoA or US $220 if done at embassy. Before it was appx $40 via VoA and $80 - at the embassy.
Americans were #4 in terms of visitor numbers in the country and probably spent most per visitor. I would expect that with these visa fees their numbers will decrease tenfold. If family of four finds out that they need $650 more just for visas, they will skip Vietnam altogether and go to Thailand, Malaysia or Indonesia where it is visa free.
Really good way to shoot yourself in foot.
P.S. I am glad that I have second passport in additional to US - still can get Vietnam visa for US $40.