So I go from knowing nothing about Airbnb to posting twice in a week.
PSFK have just written about the rise of 'community travel' which, not surprisingly, mentions the likes of Airbnb and Couchsurfing (to show no favouritism!).
They link to another Airbnb film, which sells the emotional benefit of what they offer alongside the functionality...something on-line businesses sometimes forget to do. Nice...