This whole page is a kind of "view source" hands-on exposition on how embedded (or not embedded, for that matter) SVG fonts work, if you feel up to a little cross-referencing of the data in the logo and in this break-down of its glyph paths. The tidy github logo plays the role of example:

In this SVG version of it, the "SOCIAL CODING" part is actually encoded as human- and machine readable, web-spider indexable, user-selectable plain text, rendered as the logo font (Futura Heavy) would, since the glyphs used are actually embedded in the file itself (don't pay too much attention to the font size; I've set a huge viewBox):

<text x="1984" y="4352" font-family="Futura Heavy" font-size="1096">SOCIAL CODING</text>

At present time of writing (2012-06-24, Chrome 19 era), not all browsers grok SVG font kern tables, but Opera does. (Typesetter points to you if you can tell which character pair gets miskerned without looking at the source, if your browser doesn't! :-)

Since SVG fonts, like other font standards, measure coordinates with the baseline at 0,0 of the coordinate system, increasing numbers moving upwards, unlike how SVG coordinates work in general, I've applied a vertical flip transform (scale(1 -1)) to make it look right. For reference, I also painted the "total glyph size" and "glyph used space" outlines, and marked the location of 0,0 and the beginning of each path with little red dots. Enjoy!