Build your own city at MyMiniCity! Select a country, name your town, and then revisit to see it grow. I created Neatorama City, which is supposed to grow as more people visit. Last time I looked, there was a population of two.
Update: Just a couple hours later, the population has soared to 99, unemployment is at a staggering 49%, but there is still no crime.
You can start your own city, too. Link -via Dump Trumpet (who has a new URL)