Digital Camera Noise How To

PCWorld have published a useful guide on how to deal with digital camera noise, it looks like it's well worth a read if you're struggling with noise:

"The ability to change your digital camera's ISO level is a mixed blessing. Increasing the ISO allows you to capture sharp pictures in low light by increasing the camera's sensitivity, but it also adds unwanted digital noise to your picture--which looks like the grain you'd see in a print made from very fast 35mm film."