How to prevent the Camera Jitters?

I, too, have a digital camera w/o anti-shake. I really concentrate and hold the camera as super still as possible and take about 5-10 pictures that way, then choose the best one later and delete the rest. Sometimes I'll hold the camera against my head or chest for more stability, only problem with my chest is sometimes my heart's beating can mess up the shot. The later method may require a little more guesstimated aiming.