Zeedex gives you lists of words to help you search. For example, a search for "dog" would return traditional search results, but also show you lists of dog breeds, dog-related jobs, and other dog topics. And you could add any word from one of those lists to your search by clicking on the check box next to it. Like wikipedia, anyone can edit and add to a list. The idea is to create a super-index of ideas, things, people, etc. to help people when they're doing searches. If you create a list, you also get a free text ad for your site that goes on the list.