If you’re looking for a way to use LaTeX from inside Inkscape on Mac OS X, grab [1] and copy textext.inx and textext.py to Inkscape.app/Contents/Resources/extensions.
You’ll need pstotext and pdf2svg as well, both are provided by MacPorts.
Now you should have a “Tex Text” option under the “Render” selection in Inkscape menubar.
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[1] http://www.elisanet.fi/ptvirtan/software/textext/index.html