Ryan Finlay makes a full time income by re-selling items he finds on Craigslist. He profiled how he started and what type of income he makes today.
A year into the job I was able to find, purchase and sell these items in a 25 hour work week. By focusing on higher profit items and learning the trade over the year, I raised my hourly income from $12/hr to $38/hr.
There are also quite a few gems in this one about how to sell your own items on Craigslist more successfully.