Has information about the scientific classification of tapirs as well as a list of species. This site has a lot of information about the tapir's appearance as well as information about genetics, lifecycle and conservation.
The Tapir Preservation Fund
As a site that specializes in tapirs, this site has a lot of tapir information and is well worth a visit. It has a variety of sections to the site including "Tapir Science, Conservation and Medicine" and even has a link to their Google group about tapirs.