This zen cart modification will allow your customers to ask you a question about a product and will include all of the specifics of the product such as the product name, link to the product, model number, etc.  It shows up as a sidebox when a product page is landed upon.  When the customer clicks the link it takes them to a page similar to the contact us page to ask their question.

Core file modified:
includestemplatesYOUR_TEMPLATEtemplatestpl_product_info_display.php

Works with versions 1.3.9, 1.5.0, 1.5.1, 1.5.3, 1.5.4, 1.5.5, 1.5.6