Awesome links! Thanks.
For now I'm using a relatively cheap camera (a Sanyo Xacti), and a cheap flexible leg tripod (I need a better one). The lighting certainly wasn't ideal, so that will be my next step. In the past I've had good results photographing metal by building a 3-sided box out of white cloth, and then reflecting daylight spectrum CFLs off of the cloth to avoid issues with bright spots. The toned coins are a new challenge because you have to get just the right camera angle to see the colors.
These shots were just a quick setup putting the coin on a cutting board over the kitchen sink with an undercounter tube florescent as the main source of light, but I also had a lot of warm tones coming in from the ceiling light.
I haven't adjusted white balance
No flash
Using single point focus
No timer