What is the best camera out there for freelance photography?

You're going to be wanting a very versatile camera that can be used in every situation, so you're going to have to look at something like the canon 7d, or 1dmkiv, or if you look at the Nikon range, you could look at the new d7000, or the d3s. Of course all this depends on your budget, and lest we forget about lenses, you WILL need: a 24-70 f2.8, a 70-200 f2.8, And a 50mm f1.4, that way you have every possble aspect covered, ensuring maximum image quality, and more importantly customer satisfaction :)

you could wait for the new Sony a77, which is set to blow the roof off the camera Market, with rumored ISO's up to 200000 :O