I've enabled SVG uploads and rendering.
SVG images are automatically rendered to PNG for thumbnails and inline display, currently using rsvg (of librsvg) as a converter backend. (If anybody sets up new Apaches in the cluster, make sure the librsvg2 package is installed.)
Note that some old SVGs might have bogus size information if the image table which causes rendering to fail; I'll try to get that worked out, but as a workaround you can re-upload the file.
-- brion vibber (brion @ pobox.com)