Inline SVG use

It's often suggested we use inline usage of SVG in place of rastered PNG:

Good:
 * Scales better with client zoom
 * Better print quality
 * Potential for interactivity
 * In some cases, faster transfer (SVG can have smaller file size)

Bad:
 * More important to sanitize JS for browser security
 * Possibly inconsistent rendering between clients
 * In many cases, slower transfer (SVG can have much, MUCH larger file size than rendered PNG)
 * In some cases, SVG originals are verrrrry slow display in browsers
 * (try anything with filters! Example commons:File:Anime Girl.svg)
 * No native Internet Explorer support

Things to consider
Compatibility:
 * http://code.google.com/p/svgweb/
 * Flash+JS implementation of SVG rendering which provides support for IE. Could be interesting if reliable and performant!

Performance:
 * A tool to decimate highly-detailed images to something that looks about the same in a more browser-sized way might be nice... still more scaling-friendly than a raster image, but could be much smaller than a super-detailed map of the entire US or something