GeoGreetings
http://www.geogreeting.com/main.html

The program uses buildings that look like letters, from around the world, to type out any phrase or message you like, up to 40 letters. Then you get a link to an animated page that spells out your message. You can post the link on your website.

geogreetings.png

Click on the link to see some examples:
http://www.geogreeting.com/view.html?yklmnopqrstuvwxyzABCDEFGHIJU7UCyUmyyva

http://www.geogreeting.com/view.html?yBoknIUpyBUyEBUxoGUExsDbUECsxqUwkzC