City Creator

This is fun, for adults and kids. City Creator lets you design a cityscape on your computer (not your dinnertable) in a Flash UI (UPDATE after reading their FAQ: “The pages use HTML and CSS with GIF graphics. The drag-and-drop interface was built using ECMAScript (Javascript) and the DOM (Document Object Model). The back end uses PHP and MySQL”).

You can do a medieval city (my favorite), a futuristic looking city, or a snowy skiing town.