Patterns in UX and Engineering are reusable elements that provide inspiration for solving common problems.
Product Patterns extend this concept by looking at the various mechanisms at a more abstract level then lines of code or those drawn on wireframes.
The following are examples of common patterns used in some of the best web products and are organised according to Dave McClure's pirate metrics (http://500hats.typepad.com/500blogs/2007/06/internet-market.html).
Use this as a way to inspire conversation. Ask if any of these patterns could be used in the context of your product?