Hi! I'm Dane Carlson, and welcome to the Business Opportunities Weblog. I've been publishing this website, by myself, and sometimes with the help of others for over twelve years now. You'll notice two things about this site right away:
Dan Sherman found an article about a company in the UK that is “an online marketplace linking those looking for somewhere to stay during the working week with those who have a spare bedroom they wish to let from Monday to Friday.”
On a national level, I don’t know if something like this would be feasible in the United States because the enormous scale involved, but its still an interesting idea.