"dust on your sensor"
A-ha! Now I'm getting somewhere!
I'll search around the forum for sensor cleaning tips, but if anyone has any cleaning dos and don'ts that aren't obvious common sense things, please post them here.
I have a Nikon D40 that serves me well for the amount of photos I take (except that I want a better flash/flash diffuser). I've noticed that the D40 has begun producing images with a small grey spot in the lower right hand corner. Swapping lenses (I only have two, an 18-55mm, and a...