Inkscape is my vector editor of choice for several reasons.

Handles AI, EPS, PDF, SVG and a slew of other vector and raster formats
It’s open source and free
Runs on all major operating systems–Windows, Mac OS X and Linux

Last week, Inkscape’s newest version, 0.47, was released.
What’s new in Inkscapes latest version? Lots.
What’s New in Inkscape 0.47?
Improved UI [...]