SVG Web is a JavaScript library which provides SVG support on many browsers, including Internet Explorer, Firefox, and Safari. Using the library plus native SVG support you can instantly target ~95% of the existing installed web base.

Once dropped in you get partial support for SVG 1.1, SVG Animation (SMIL), Fonts, Video and Audio, DOM and style scripting through JavaScript, and more in about a 60K library. Your SVG content can be embedded directly into normal HTML 5 or through the OBJECT tag. If native SVG support is already present in the browser then that is used, though you can override this and have the SVG Web toolkit handle things instead. No downloads or plugins are necessary other than Flash which is used for the actual rendering, so it's very easy to use and incorporate into an existing web site.

From time to time I need to debug OAuth-protected APIs, checking response headers and examining XML and JSON payloads. curl generally rocks for this sort of thing, but when the APIs in question are protected with OAuth, things break down. Likewise for benchmarking (ab, httperf, etc.) and exploration–isn’t it nice to browse APIs that return XML in Firefox?