Due to the overwhelming interest for SVG conversion tools, I've decided to release my port of cairo and related tools...
In addition to the svg2pdf/png/ps tools it also comes with a nifty installer and a batch-conversion utility that will aid you in converting your massive collection of SVGs in one swift go.
Anyone is free to make a datatype ofcos, the sources are there, and it shouldn't be too hard, however SVGs do not shoehorn very well into the datatype model .. there might be other things that are more suited for it... ;)