Matthew, can describe exactly what you did to get an SVG file working? It would be nice to have this for future reference, and I might link it in to the FAQ.
1. Added svg mime type to config.tcl file at "ns_section ns/mimetypes" like so
ns_param .svg image/svg+xml
2. Then to view a SVG file it needs to be referenced like so
<EMBED SRC="filename.svg" NAME="SVGEmbed" HEIGHT=400 WIDTH=100%
TYPE="image/svg+xml" PLUGINSPAGE="http://www.adobe.com/svg/viewer/install/">