Bracer Jack has a nice modeling tutorial on the Iron Man helmet, especially focused on techniques for modeling hard surfaces. He even offers the files containing his 3DS Max schematic drawings to get you started.
Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.