This is the tale of a sites with their own classified ads, when they wanted to track how often users who post a classified, were "contacted". Their goal was to be able to see if the classified were successful, based on the volume of responses to the classified ads. A great idea... now I have to implement it.
The setup and layout for this content type is pretty basic.. The Classified Listing is displayed as a panel. The top half is info about the listing (node), and the bottom half is a contact form (send user email form), that sends and email to the user who posted the listing, from the logged in user.