Based on the comments (here, on other blogs, and on social networking sites) that followed Adam Cherubini's presentation on nailed furniture, it sounds like many of us are interested in working with period fasteners.
If you're looking for cut nails but are confused by all the varieties, Tremont Nail Company offers two sample boards* (one is card stock and the other is wood) which can be hung on the wall in your shop.
Each board comes with an actual sample of each the 20 different kinds of cut nails that the company sells. So you'll be able to decide exactly what you need for your projects.
*I do not benefit in any way from the sale of these sample boards. I ordered one today and thought you guys might be interested.