Who said that Linux has nothing to do with graphics editing didn't try one of these pretty nice and, if I may say so, production ready vector graphics editors.

Inkscape

An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.

Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more. We also aim to maintain a thriving user and developer community by using open, community-oriented development.

Resources
Inkscape

Karbon14

Karbon is a vector drawing application with an user interface that is easy to use, highly customizable and extensible. That makes Karbon a great application for users starting to explore the world of vector graphics as well as for artists wanting to create breathtaking vector art.

Resources
Karbon14

Xara Xtreme

Xara Xtreme for Linux is a powerful, general purpose graphics program for Unix platforms including Linux, FreeBSD and (in development) OS-X.

Formely known as Xara LX, it is based on Xara Xtreme for Windows, which is the fastest graphics program available, period. The Xara Xtreme source code was made available open-source in early 2006, and is being ported to Linux.

Resources
Xara Xtreme