Colorbox is a pretty nice JQuery plugin having a lot of cool features. Recently we had worked on a Drupal project in which we had to load some content programmatically via Colorbox. To be more specific we had to load the Drupal node/add form within Colorbox before presenting it to the user. If you are facing the same scenario in your Drupal site and want to know how to load a node/add form inside a Colorbox popup then follow the steps mentioned here.