I’ve had a link to City Creator on my Examples of Student Work page for quite awhile under Student Cities.  Students can easily design cities, describe them, and email the url to a teacher for posting to website or blog.  You can see several examples my students made on that page.

I also recently discovered another similar site where you can design an English village from the 1930′s.    It’s called Virtual Village.  I’ve placed this link next to City Creator.