When reducing SVGs for data urls, I've found you can reduce size even further by scaling the image up, then rounding coordinates to integers. I've written a few scripts to assist with this, but I imagine you could get a similar effect in Inkscape by snapping everything to an integer grid.

Also, merging path elements together helps.

For example, here's the logo in 1952 bytes: http://pastebin.com/YYBpWsDE

And I'm sure there's further room for manual reduction, maybe by switching between strokes/fills and further cleaning up the paths.

(It would be cool if someone were to work on an automated system for doing this kind of simplification. But I have a feeling that it's difficult find a general technique that will work across SVG hierarchies, like scaled/rotated groups, etc.)

Nice! Can I use it?

(If you want, you can also submit a patch in https://github.com/badges/shields.)

Yeah, it's your artwork, I just optimized it.