By digging through the forums here and on the plugin site as well as playing with one of your supplied themes, I've figured out 3 of the template names for customizing things. Is there a list somewhere that I've missed.
Copying the single.php file and creating a file called single-download.php will allow custom changes to the individual product pages. i.e. remove comments, date, author box, etc.
Creating a custom category/archive page uses a file called taxonomy-download_category.php. (information that should be added, among other things, to the grid layout tutorial)
Custom tag page is taxonomy-download_tag.php
Are there options to create any other custom pages via the themes like these three? What are the file names we should use?