The Colorbox module has now replaced Thickbox module for lightbox effects here on xdeb.org. Here follow some background around the projects.
In the Drupal 4.7 days I was looking for a jQuery based Lightbox solution and found the ThickBox plugin. I developed the Thickbox module to integrate it with Drupal. Today it’s used on more than 19000 web sites.
Since a couple of years the Thickbox plugin is no longer maintained and it’s becoming cumbersome to keep it updated with good browser support. Time for a new solution.