As was said, contact Community Forklift or a Habitat Restore....many Restores will remove for you and you get a tax deduction for the donation. Hardwood flooring is definitely worth salvaging and is sought after by these "building deconstruction" firms (assuming it hasn't been sanded too many times). Always remove from the tongue side. I bought about 1000 sf of salvaged red oak flooring from Habitat and used in a remodel of my home.......looks beautiful and you can't distinguish it from the original flooring in the house. Removing nails can be a pain, but there are pneumatic ("nail kicker") tools that make it easy. Restores that salvage use these.
Bob Falk , Author "Unbuilding: Salvaging the Architectural Treasures of Unwanted Houses"