Learn 10 new words per day in a variety of languages at Learn 10. You can do quite a bit for free, like listen to the words and test yourself.
CouchSurfing. Heard of it? Well, according to couchsurfing.org:
“CouchSurfing isn't about the furniture- it's not just about finding free accommodations around the world- it's about participating in creating a better world. We strive to make a better world by opening our homes, our hearts, and our lives. We create deep and meaningful connections that cross oceans, continents and cultures. CouchSurfing wants to change not only the way we travel, but how we relate to the world!”
And this family has been CouchSurfing with a baby!