I recently happened upon another missing persons site that may pique your interest. It is called They Are Missed.

However, the site is not limited to missing persons. It also lists unsolved homicides.

The address: http://theyaremissed.org

At the site, you will find profiles of those who were also profiled on Unsolved Mysteries. They include (but are not limited to) the following:

Adam John ("A.J.") Breaux
Tara Leigh Calico
Amy Lynn Bradley
Elizabeth Campbell
Rachel Cooke
Tammy Lynn Leppert
Gordon Page, Jr.
Pamela Page
Star Palumbo
Bobbi Parker
Hyun Jong ("Cindy") Song

This site is definitely worth a look.