Thanks for all your help, guys. The saving to .dxf directly from Inkscape did the trick.
I work in a factory. We have this fancy, half million dollar machine that cuts parts from sheet metal with a laser beam. ( http://www.trumpf.com/ )
Someone had something they wanted to scan and then cut out on the machine. I scanned the image, used Gimp to make it so it was just a black outline on a white background, then imported the resulting bitmap into Inkscape and ran trace bitmap on it. I simplified and cleaned up the resulting .svg, then saved it as a .dxf, which the Trumpf software could convert and use to cut out the shape.
The examples below were done directly in Inkscape (not from scans) and saved as .dxf. There is a picture of the resulting cut metal objects in sixteen gage sheet metal.
http://img219.imageshack.us/img219/9753/piee6.png
http://img255.imageshack.us/img255/5249/biohazarduv3.png
http://img105.imageshack.us/img105/990/metalshapesys1.jpg
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