The internet is far more than porn, spam and spyware. Although there is plenty of garbage out there, the good far outweighs the bad. The 'killer app' for the internet is information. It may be news, health information, weather, hardware drivers or game reviews. The type of information is not what matters; availability, accessibility and specificity are what is important.
An example of specialization of the net is Breederville.com. Breederville is a fledgling site intended to provide information and resources for those interested in breeding, animal productions, sales, buying, animal welfare, preservation, and rescue.
The vision of Breederville.com is to extend a helping hand to the small to medium 'mom and pops' as they buy and sell animals. The primary method of connecting buyer to seller is through an online Auction. The auction board provides nationwide direct marketing for those who would not otherwise have access to that kind of resource.