AUTechNet have recently installed a Gallery3, an opensource gallery for managing photos via the web on our media.AUTechVPS.com server.
The opensource Gallery, particularly the Gallery 3 version has been in development since 2009.
The benefit of using your own photo management system means that your photos can be on your website, not Flickr or Photoshelter or any other photography specific site. The benefit behind Gallery3 is the data is yours and is on your server and not in the hands of someone else.
Gallery3 allows for complete control over your website and the way it looks, even though many just choose to stay with the default Gallery 3 templates provided.
Read more about the Gallery project.