That was tough experience converting between Riel and USD. And I think they should ban using dollars. It makes everything more expensive. I mean most stuff costs $1, because it's hard to split it further without using local money. Like in Thailand, $1 is about 60 baht. So you can conveniently split dollar at least by 6.
People constantly begging for money almost everywhere. Victims of war, mothers with babies or children with big eyes. Striking thing was not that I never seen it before. I've seen lots of stuff like that back in Russia. It was that I haven't noticed anything like that in Thailand. Still mistery for me.
Sometimes it is interesting what things remind me about my motherland. When I talk with Chinese (esspessially mainland and HK) they remind me Russians by their lifestyle choices and maybe a bit of temperament. And now beggars in Cambodia.