Early 3D Adopters: Who's Doing 3D Printing?

Everywhere you look, people are talking about 3D printing. But talk is cheap. Are there any commercial printers who have actually invested in 3D printers? Are they using them to produce commercial jobs? If so, what markets are they serving?

The numbers of 3D printers installed at commercial print shops is still quite small. Most devices are purchased by hobbyists, online operations catering to consumer projects, and service bureau-type installations servicing engineers and prototype designers in the medical, industrial and manufacturing markets.