Part of the Arduino schematic (via)
Mikey Sklar has a good overview of how to get started designing circuits:
A blog reader asked me earlier today how to get started with circuit design. After very little thought I replied directly via e-mail, but I’d like to share my $0.02 with the rest of our readers who might be interested. Hopefully others who are already on this path can drop a line in the comments for this post about how they got into electronics/circuit design/microcontrollers.
Check out the rest of his post here, and please share your own suggestions for budding designers!