I am in the process of adding new products to my website, but I do not want to make them available yet. How do I do this?

In the template set configuration file, add a new ProductPage line. For this new line, specify a name of the template set, but do not include a path for the input file. An example would be:

ProductPage25 No Page:
When your store is generated, the product page for this product will not be created.