I love that it's such an interesting way to introduce them to new information. We've gone way beyond geography and discussed history, weather and climates, seasons, famous Americans, transportation, mapping and distances, architecture, and the list goes on. We've discovered places we'd never heard of and lots of places we hope to see some day.
Our collection is ever growing and I've posted an album of some of our cards. We have tons more that I will add...one day, when I find the time to scan them all and upload them.
This has been a great project for us. I think we'll keep collecting as long as we are enjoying it and learning new things. This year I hope to take our project around the globe and add a flat Stanley collection to our project.
Here are some more links to fun geography-related project for kids:
Pen Pal Resources @ A to Z Home's Cool
Pen Pal Notes