A simple explanation about the Gerber format. What is it? what does it do? What is the standard?
Some really cool circuit ideas for your next electronic project
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