For those interested in learning more about extensions, here are two that might be worth incorporating:
http://vdxtosvg.sourceforge.net/ http://www.solidcode.net/pdf2svg/
Try them out - do they actually look useful and compatible with Inkscape?
If so, add them to our extensions. You'll need to create a .inx file (see /usr/share/inkscape/extensions/ for examples), and test it out on a variety of files to make sure it's not too buggy. Then post a patch to the patch tracker (or report back if it looks like a no-go).
Also, if you can find any other xxx2svg filter programs out there, go ahead and test out adding them too. Good places to look include svg.org and Freshmeat.net.
You can also create your own filters pretty easily using packages such as perl's SVG.pm. I had good luck at hooking together SVG.pm and Perl's POD converter to create a pod2svg filter. ;-)
Bryce