This is awesome. A SUPER easy-to-use program to draw up diagrams for your Arduino projects. It's as easy as using MS Paint!
Download for free here: http://fritzing.org/
You can also convert your sketch into a PCB layout or standard schematic. You can export it as a .jpg, .png, or even a .pdf! You can also upload your schematic and project to the Fritzing website and share your project and code with others!
it took me less than 20 mins to draw this up, upload it to the website and share my project!
http://fritzing.org/projects/arduino...servo-control/