SketchChair is a piece of software that takes the engineer out of engineering furniture. In a child's-dream-come-true you draw the outlines you'd like to have, add some legs, and the software pops out a design ready to be laser-cut.
From the web site:
The Sketch Chair software allows a novice users to take part in the entire process of designing and building their own chairs. Chairs are designed using a simple 2D sketch-based interface and design validation tools. Thereafter chairs are fabricated from sheet materials cut by a laser cutter, CNC milling machine or papercutters.