Inkscape for newbies: http://blog.ponoko.com/2008/01/21/how-to-inkscape-for-ponoko-newbies-trace-an-image/
Inkscape for newbies: http://blog.ponoko.com/2008/01/21/how-to-inkscape-for-ponoko-newbies-trace-an-image/
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Experiment with settings to find the lowest possible power and highest possible speed to get clean vector cuts. The new optics and tube (as of December 2014) can cut many organic materials with a minimum of charring.