Drupal has its own gallery modules also available but to have enhanced functionality i recommend integrating Gallery2 with your Drupal its easy and a nice how to is available @ http://codex.gallery2.org/Gallery2:How_to_Embed_Gallery2_in_Drupal To see a demo of this Gallery in Drupal check www.kashipur.in's Galley Section.
Integrate Gallery 2 With Drupal
