For those of you using a DSLR, my settings for this photo were as follows: f4.5, 1/100, ISO 160. I prefer to use my 17-55 2.8 lens as I can zoom in and out, but a fixed 35 or 50mm lens works as well. The key here is not lowering your aperture too far. If you use a lower f-stop, your layout may be in focus in the middle and blurry around the edges. Also try to use a shutter speed fast enough to compensate for camera shake, unless you are going to use a tripod. If you have good light, an ISO of 160-200 is adequate. Remember, the higher you set your ISO, the more grain you will have so try to keep it in the lower range.
Stand straight above the layout and shoot. I take about 5-6 photos so I know that I will have at least one good shot!
I also like to take a few detail shots. For these I get down right next to the layout and shoot a few pictures with a lower aperture, typically f2.8. I like to do this so you can see the dimension in the embellishments that I've used.