Photographing Shiny Objects
If you haven't read "Light: Science and Magic: An Introduction to Photographic Lighting" by Fil Hunter, Steven Biver, and Paul Fugua, then you are missing out.
This book is quite amazing. OK, there were alot of things I probably already knew. But, there were a few tips and tricks I didn't know!
If you have a shiny piece of metal, then what you will have to do is get a sheet of polarized plastic and put it over your light source. This will create the polarization that you will need to completely block the direct reflection when using your circular polarizer.
Now I can be more creative with your lighting than simply setting up a huge light tent to encapsulate my subject to create diffused lighting to get rid of those pesky reflections!
The book has many more examples. If you want to master light, I suggest you pick up this book. Its name lives up to its contents...there is a little bit of science AND magic in it!!!