Laos is absolutely beautiful. Try Luang Prabang (midnight bowling lol) and the thousand islands, shhhh. Its totally different to Thailand, in Thailand people say hello to you because they want to sell you something. In Laos people say hello because they are friendly.
Defintly worth checking out if your in the neighbour hood.
BTW you can travel up from Cambodia to Lao for some reason Lonely Planet says you can't.
Sorry about spelling but its so early..