Scot's Product Counter for Miva Merchant 5, $19.95
Displays the total number of products next to your categories as a link to your category display page and displays all the products in that category instead of a small group of them.
Scot's Product Counter is free to try, so give it a shot by clicking on the download link at the top of the screen.
Version 1.00, March 29, 2009:
• initial release