Who said being green isn't profitable? A new company called Planet Reuse is seeking to become the online classifieds for reused construction materials. By allowing sellers to post their materials for free (including pictures, description, quantity and cost), buyers can then browse the wares to find the best fit for their project. It's a win-win: Sellers get rid of old material destined for the landfill and builders get affordable building material. Not to mention freeing up space in the landfill. Win-win-win.