While not specifically a Web Rule, the following enhancement was added that utilizes a field in the database that is involved with Web Rules functionality so is included here:

The Action to execute when this item is sold on the web field in the Item Edit form (SysManager > Item Edit form > Web tab) can now be used to apply a special to an item sold through E-Commerce module. The macro SPECIAL() is used to apply the special. To get this to work one would enter, for example, SPECIAL("WEB25%OFF ") into the Action to execute when this item is sold on the web field and that special is applied to the item when sold with the E-Commerce pages.