The main Drupal core ladder is currently found at:

http://drupalladder.org/ladder/ee503327-50be-1904-8d04-9499098cad64

This is absurd.

Let's add a path alias for this ladder, since it's kind of the main focus here. I don't know if we can do /ladder/core since the menu callback in ladder.module (ladder_page_view()) might get used instead of the alias. We might need to use /core-ladder instead.