The 8 MP camera is one of several new hardware features present in the iPhone 4S. It's a significant upgrade that'll entice many shutterbugs to drop their current phone and switch to Apple's latest handset.
If you are on the fence or are just interested in seeing how the 4S camera performs, then you must check out this sample gallery of photos on Apple's website. Yes, the gallery is chosen by Apple and it has the best of the best photos, but still it's nice to examine the quality of images that this new shooter is capable of producing.
To check out these photos, point your browser to Apple's website and click "view the gallery" on the right side of the page. Drool