Adding a URL to the search engines individually by hand.
Manual search engine submission may be more time consuming than automated search engine submission, but a fair amount of optimization specialists stick with the “old fashioned way.”
Why? Submitting manually is seen by some SEO professionals as a way of staying on the good side of the search engines, lessening the risk of being associated with the steady stream of spam submitted through automated programs. AltaVista has even implemented a submission process to discourage automatic submission. If the program is a success, other search engines may follow suit.
see also: SEO Tools
Google – Submit URL
Search Engine Marketers Prefer Manual Submission to Auto-Submit Tools
Search Engine Watch (March 20, 2000)