Are you a serious photographer who also happens to own an iPhone? You're gonna want to check this out.
The microRemote DSLR focus controller wraps around your iPhone and turns it into a remote for your high-end DSLR. And it doesn't just remotely take photos for you, oh no. It has a physical focus ring on the side to let you adjust the image focus. The screen features aperture, zoom and focusing assists as well. Basically, you have full control over your camera from afar.
Of course, all this functionality will set you back. $1,000, to be precise, when it goes on sale this summer. But if you're a pro, it might be worth it.