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Just add unique content.
No spam.
No blackhat methods.

http://pointblankseo.com/link-building-strategies
My favorite list.

http://wordpress.org/showcase/
http://drupal.org/case-studies
http://community.joomla.org/showcase/sites.html
http://www.webiny.com/showcase/

Some of the famous sites use by some popular CMS,...

answer is CMS ( Drupal, WordPress, Joomla, etc. ..)

My vote is for drupal. More difficult to use, but the proper configuration is far better

To sum it up, Joomla is fantastic, but Drupal got to cover our needs in a better way.