Directory Submissions - Yahoo! - DMOZ (The Open Directory aka ODP) - Zeal
Newer generation
spider-based search engines employ complex mathematical
algorithms in an attempt to assess a website's theme. By
reading visible
and invisible text found on a website and
on other website pages that link to it, search engines are
able to determine which words and phrases represent a
website's theme. Where as website optimization helps the
search engines establish an intended theme, determining
which keywords are best suited is an essential starting
point for any website optimization campaign.