I successfully, manually installed Drupal 6.6. Everything's working fine except for the Clean URLs. When I go to enable Clean URLs the Drupal radio buttons are disabled and the page shows an error message: "Your system configuration does not currently support this feature."
The Drupal documentation says that Clean URLs requires apache mod_rewrite. I thought that mod_rewrite was installed by default on all shared plans.
(If it's any help, I wasn't able to update .htaccess with Drupal's version.)