As a freelancer, I still have at least one week a month where I don't have checks coming in. A friend suggested I look into focus groups, a great way to earn tax-free income with little effort. Thanks to Craigslist and a few other web sites, I've taken part in focus groups for everything from alcohol, clothing, commercials, movies, TV shows in development, and vacuum cleaners. Sometimes they even serve snacks! Last year I made $1,500.00 from focus groups. Not too shabby!