Yes - our newest atheist blogger, The Homeless Atheist, is homeless. He lives in the woods of Olympia, Washington. You can watch I Live In The Woods to see his camp. His blog's about section is interesting.
Ever wonder what it’s like to be homeless with the dilemma of theist missions, soup kitchens, and faith based services? Many homeless are coerced with mandatory evangelical church services if they want something to eat or shelter for the night. What if you are homeless and atheist, agnostic, secular humanist, pantheist, or even Buddhist atheist? If so, your choices are marginal for finding a secular service or shelter. I am homeless and atheist; a quasi Buddhist too.
Source: The Homeless Atheist