They are
SEO friendly and
SEO friendly means more to me than just providing a direct link.
A
SEO friendly directory:
- provides a direct link
- does not have multiple directories stored on the
same IP or
IP C Class
- does not have
duplicate category structures as other directories
- site is ranked reasonably well in the search engines
- does not have a predominance of non
SEO friendly backlinks (e.g. sitewide links, repetitive link text)