A bit a pity as traveling slow thru a city is the best way to explore and see a city. Luckily you can still find Samlors in some places like Phitsanulok, Khon Kaen, Chiang Rai and Chiang Mai. In Chiang Mai you can even make a tour with a Samlor. For more information see Chiang Mai On Three Wheels. There are many kind of Samlors, for more information & Photos about other types of Samlors see Samlors in Thailand
And I did learn that even in some parts of Bangkok you will still find samlors!