Wazuki,
For Fantastic shots that are Ultr crisp like Bone always posts, a tripod or a Monopod are actually a must! I use both, or I hand hold, depending on the conditions. I am fortunate to have pretty steady hands, but every chance I get when I am shooting I will brace myself and the camera up against something.
Fast shutter speeds (when possible) are also a great help because it cuts down on the time you have to mess up a shot due to camera jiggle.
Dick