I recently added support for the new SVG 2 'paint-order' property to Inkscape trunk (behind a compile time flag). Here is a short blog about the property. Chrome and Firefox nightly also support the property.
Did you ever reuse someone's work of art and then forget to credit the person? Commons Machinery project is about to fix that once and for all.
This video demonstrates proof-of-concept patches for GIMP and +Inkscape, as well as extensions for +Mozilla Firefox and Aloha HTML editor that make remixing while properly (and automatically) crediting collaborators a reality.
I personally choose to avoid most of the headache(s) by using items in public domain whenever possible but any sort of automation to assist with or to directly credit (as a configurable option rather than a hard-coded default) would certainly be welcome.