I would also add that if I had a lot of time and resources and a spacious studio, product photography would be fascinating. The effects you can achieve with different types of lighting, light tables, shadows and reflections, snoots, etc really present some amazing challenges and when overcome, the photos can be amazing to look at.
I have a book from a "Pro-Lighting" series that shows the lighting setups for a lot of great effect product shots. Some of it even involves light painting, etc too. It was from 1994 by Hicks and Schultz.