I like the idea of "couchsurfing". You offer an accomodation and because of that you can easily find an accomodation all over the world. That's fantastic, isn't it? Besides I prefer staying with some " locals" than being in a hostel, because it's more private and you can get some recommondations and informations about the city, the country etc.

I have made many great experiences yet. But one I will definetly never forget is my five month trip through New Zealand, Australia and Indonesia after I finished school!