I recently purchased software that will allow you to perform web searches for specific search terms. The software generates pages based on the search results and looks for domains in the search index that are no longer registered. This is a good way to find domains with no backlinks but they are very hard to locate on the major search engines because they are removed from the index quickly. Are their any crappy outdated search engines you can think of that take a while to remove sites from the index? I was thinking I may get better expired domain results from these.