I have done voluntary work for the newspapers as well as the red cross and our local habitat for humanity, so it is possible to use these types of resources to get your foot in the door, habitat likes to have their building programs highlighted for their mail out brochures as well as their websites, as does the red cross, the newpapers will often times take images of local sporting events, teams and such, I know, maybe not the excitment your looking for, but it is a place to stop and check, another area I have worked in is as voyureistic as it may seem, I have photographed auto acidents, wildfires, hostage standoffs and such that have been used in the newpapers as well as regional magazines, your main goal is to get your name out there as a photog that can get the picture ethically and are not afraid to work in tough situations, but starting on a local level is the least expensive way to get into it, at least this is what I have found, I try to carry my camera with me at all times, to document everything from human interest, to human tragedy...
Good luck, it is a tough business to break into, build your portfolio and you may see some success.
Dave