PDF Search Engine: http://www.pdf-search-engine.com/ This site lets you search the web for .pdf files. This is really handy! I use it to find product manuals and research papers on a wide variety of subjects.
Design a robot online: http://www.mos.org/robot/robot.html This is a cute little site that lets you test your skill at building a robot. See if you add the correct parts to build a robot for the task given. A neat site for kids and adults. Check it out.
If you are like me, you often forget what the color codes of resistors are. This is a great graphic to help you remember what the color strips means:
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