One of the small annoyance I find irritating with digital SLR is the presence of dust on the CCD sensors. Lets face it, the lens gets changed quite often, and every time you do it, some small particle gets into the chamber and then next time you snap the combination of the mirror going up and the charged CCD attracts dusts to the CCD. I took some long exposure shots last night, and noticed that there's a rather large streak of blurred section of the image. Right after that I did a mirror lockup and saw an obvious piece of fibre on the CCD. Arrggghhh!!!