A simple explanation about the Gerber format. What is it? what does it do? What is the standard?
Printed Circuit Boards - Tutorials, Tips, and Guides to Get Started
Because your own PCB design makes it easy to design circuits with lots of components. And you can use modern chips that come as surface mount devices (SMD).
And PCB design is a skill that anyone can learn. Actually, it's both cheap and easy to get started!
This page contains a library of resources to help you get started designing your own printed circuit boards.
This article explains how you can create a cheap PCB for your electronic circuit and lists some PCB manufacturers.
A few simple PCB design guidelines for creating better board layouts
A step-by-step PCB design tutorial on how to design a PCB layout in Eagle
Tips to minimize the chance of errors before PCB manufacturing
A tutorial for schematic drawing using Cadsoft Eagle