Here's some important safety tips to remember when you're using a circular saw. Remove jewelry and loose clothing first and always wear eye protection. Before you plug in, make sure your blade is tight and sharp and never tie back the blade guard. Steady your work and stand to one side. When the blade is at full speed, push the saw forward smoothly without forcing it. And of course you should never reach underneath.
For more on power tools, consider:
How To: Saw Safely
Radio: Tool Tip - Circular Saws