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Just a quick conclusion to this article about getting tack sharp images from your camera.  If you are handholding your camera, you don't realize how much the camera may be shaking.  So another way to keep it steady is by wrapping the camera strap around your arm tightly, just above your elbow and pulling the strap tight.  This makes your camera more stable in your hand.  Pull your elbows in tight to your body, as well.

For some cool camera straps, my favorites are BlackRapid Straps. But for more economical choices check here.

You can also lean against a wall to help keep yourself steady, or lean or lay your lens on a railing, fence or any other already stationary object.  These tips can make a big difference in improving your photographs and getting them tack sharp images.