A circular saw is more versatile than you might think. These tips from Tim Carter of AsktheBuilder.com will help you get more out of your circular saws and make better cuts. You can get a smooth line if you cut along with the grain of the wood. You will get a lot of splintering if you cut against the grain. You can also cut curves with a circular saw. 

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Discover more on circular saws at askthebuilder.com:
http://www.askthebuilder.com/which-circular-saw-should-i-buy/
http://www.askthebuilder.com/tool-use-tips-circular-saws-and-power-drills/
http://www.askthebuilder.com/how-to-use-a-circular-saw-like-a-pro/
http://www.askthebuilder.com/cordless-circular-saws-video/