Thanks! It's unfortunate that it's Chrome-only. It worked well on their examples, but not on this (not a d3.js):

  http://www.cluster-text.com/tmp/news.svg

Still, it's an interesting start.

Correction: It somewhat works if you wrap the SVG in HTML:

  http://www.cluster-text.com/tmp/news.html

although, when I load it into Inkscape the positioning of some text labels is way off (some aren't too bad) and some hidden elements are displayed.