Those longing to use a US$3,000 camera lens with their iPhone 4s are in luck. Photojojo has released the iPhone SLR Mount, a spiffy way to mount Canon EOS or a Nikon SLR lenses to your iPhone 4.
A slot on the mount holds lens in place, and loops on either end await the click of your camera strap.
It sounds crazy, but it's not. Huge numbers of people take photos with iPhones daily. Recent Flickr data suggests that iPhone submissions have dominated its pool of photos for a long time. It's reasonable to offer a pseudo-pro option for a camera that people shoot with that often.