If you live in San Francisco or NYC and have a bike, make some extra cash when you’re not using it by renting out to people who need it through the peer to peer marketplace Spinlister.  Rental prices average $18/ day and you get insurance for your bike from the site.  You can use the extra cash to start a little savings fund.  New York kids, get on this before bike share rolls out… if they ever figure that part out.  Come on, Bloomie!