How to make good product renders / product advertising shots

Hello all.

I’ve been seeing some really good product advertising photos lately, from digital cameras and watches to beer. I was wondering if some or most of them are done with 3d-rendering.

Just want to see if anyone know of any advertising photography resources - image banks, etc, of current ad campaigns and their images.

Or know of any good tutorials for doing that sort of thing.

Flipside has a good studio tutorial