Over at The Verge there is great little interview with Peter Belanger, who, among other clients, works for Apple. He has produced a large number of the product shots that are used by the company on their website and in advertising.
There are some great quotes and a few insights into his preferred methods for high-end still-life shoots.
It’s similar to working on a file in Photoshop: you don’t do all your work on one layer. I think of my lights as layers that I can adjust individually to get the desired results.