How to Start Making Your Own Electronics with Arduino and Other People's Code
"DC Barrel Jack Adaptor (95¢): This adaptor connects the power supply into the breadboard directly" —- No it doesn't. The DC barrel jack adapter is not compatible with the breadboard. The comments on sparkfun's page confirm this. Unfortunately I didn't read those comments until after I bought it, trusting this article's information. So now I have to solder some wires to the adapter so I can plug it into the breadboard to avoid buying more parts. But this will make the DC jack less secure... This entire project is super easy if you do it the way Rajarshi explains.
Related: Home Magic
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