Here are some websites that have reliable information on the UFO phenomenon. There are many more than listed here, and you can find several sites on the CUFOS website links page.
Find Contact Information For Government Offices In Your Area
Search Complete, Up-To-Date Public Records For Criminal And Court Systems In The U.S.
Center for UFO Studies (CUFOS)
National Investigations Committe on Aerial Phenomena (NICAP)
Northern Ontario UFO Research and Study
UFOs- Documenting The Evidence
Unidentified Aerial Phenomena -Scientific Research
Dr. David Clarke (Folklore and Journalism)
Isaac Koi – UFO Researcher (Thousands of free PDF Journals and Books)
Website Listing All Known U.S. Military Bases