It's now possible to go to http://drupalmodules.com/project/cck and get to the right place. This new URL mapping will work for all project names. In other words, all "Drupal.org/project/shortname" URLs will also work when rewritten as "DrupalModules.com/project/shortname".
Another example: http://drupalmodules.com/project/admin_menu will automatically forward you to the Administration Menu page on DrupalModules.
Thanks to Julian for the suggestion.
