One great feature available in all current DSLR cameras is a Highlight Alert setting which can help you obtain better exposed images. When this setting is enabled any blown-out (completely overexposed) area in your image will “blink” on the camera’s rear LCD display.
When you see this happen (and believe me, it happens) you can set the camera’s exposure compensation control to a negative amount (-1 EV) and reshoot the image. Its a great “real-time” feedback system built into today’s DSLR cameras that I highly recommend leaving enabled at all times. This is very important for black & white work where a blown out highlight can really ruin an image.