My newest discovery online is postcrossing.com. On this site, you can send postcards to people around the world and get postcards in return. It's been around a while, so it's a smart, easy site with some fun features. For instance, you can pull up a map that shows everywhere your postcards have been delivered.
Here's how postal services are doing internationally at the moment:
Kentucky to Finland and Germany: 12 days
Kentucky to Japan and Hungary: 10 days
Kentucky to Spain: 6 days