Here's the long tail (sort of) in action: Yahoo! Autos Custom. It's an enthusiast site (hence the LT reference) but it also features classifieds and display advertising. This is an interesting marriage of content + community in a highly specialized vertical (for more content richness and more ad targeting). It's a cousin of the Yahoo! Trip Planner site.
This is just one more interesting thing coming out of Yahoo! Here's' more from the Yahoo! Search Blog.