UFOCasebook.com Pictures - Great site for videos and pics.

UFO Evidence.org Photo Database - Great informational site.

Protree Alternative Information Center Picture Galleries - Large amount of pictures in multiple galleries.

ECETI Pictures - Photos taken at the retreat near Mt. Adams, Washington.

Billy Meier Photographs from Figu.org - Meier is one of the most famous Contactee/Experiencer. He says he talked with Plaedians outside his house in Switzerland, and these pictures and video are some of the proof that seems to have piqued the interest of the likes of Doctors Hyneck and Vallee.

Rutger's, State University of New Jersey's UFO picture files - Something I ran across that someone at Rutger's as been so kind to provide.

UFO ONLINE International Catalog - Italian UFO site, with a lot of pictures.

Unexplained Mysteries UFO Image Gallery - Many pics.

Google Search: UFO Photos - Always check for the latest.