Here you can link to and test a number of simple blog programs.  They are ranked in order of perceived ease of use, appearance, and stability.

To test the sites' functionality, you may log in with the username demo, and the password demo99.

Geeklog  http://www.ansiblegroup.org/geeklog/

To read Geeklog's documentation, go to

http://demo.geeklog.net/index.php

Drupal http://www.ansiblegroup.org/drupal/

To read Drupal documentation, go to

http://drupal.org/

WordPress http://ansiblegroup.org/wordpress/index.php

To read WordPress documentation, go to

http://www.wordpress.com/

Nucleus http://ansiblegroup.org/nucleus/

To read Nucleus documentation, go to

http://nucleuscms.org/