All of SE Asia on one visa?

AviationRecord.com
Travellers could soon be able to surf in Bali, shop in Singapore and eat spicy street food in Thailand before crossing into Cambodia and cruising the Mekong in Vietnam - all on a single tourist visa.
The Association of Southeast Asian Nations (ASEAN) is working on a plan that would open the region to foreign tourists in the same way Europe's unified visa system has streamlined travel. Full story