I've made a server that converts Blazonry (the jargon for describing coats of arms) into SVG.  The SVG I produce, near as I can tell, is mostly valid, though no web browser seems to be able to handle it well, and of libraries only rsvglib works right.  So by default the server converts to PNG, but there's an option to see the SVG instead.

Take a look at http://web.meson.org/blazonserver/ and let me know what you think!