Haha, I thought I recognized the inkscape tracer in your works. Way cool! Inkscape (to my knowledge) is the best vector program available for Linux at this point. I also recall hearing Xara Xtreme being open sourced and ported to Linux, but I don't think it's happened yet.
However, Inkscape is a wonderful tool, and even though it isn't quite up to Adobe or Macromedia standards yet - I believe it's how you use the tools, not what tools you use, that makes art great. And you can't beat the price
I guess I used all vector tools in this globe, but what makes me very angry .. that inkscape and scopidi doesn't have typography tools like freehand, flash and adobe illus. wohoo, i like call him adobe illus.. adobe illux .. hahaha just created the name