Smithsonian Frontiers of Flight:  The Threshold of Space
Documentary on the X-15
55 minutes
1992, Discovery Communications / Columbia House Video Library
 

Test Flights  -- Beyond the Limits
Subject is test flying, tape 1 has good coverage of the X-15 program
3-tape set, about 50 minutes per tape
1998, Goldhill Video
These tapes air frequently on Discovery Wings and other cable channels

The Outer Limits:  The Premonition
Science fiction with a plot centered on an X-15 flight
1965 b&w television program, 52 minutes
MGM/UA Home Video, currently available
 

The X-15 Story
Documentary, produced in 1960 by North American Aviation for the Air Force
Short, probably about 20 minutes
Copy by Traditions Military Videos, currently available

The X-Planes  (Air Combat II)
Documentary by U.S. News and World Report
45 minutes
1998, Unapix Entertainment
 

X-1 to Space Shuttle
Documentary
About 1 hour
Probably ~2000, ARP Company
 

X-15
Semi-documentary fiction, 1961 feature film
Stars Charles Bronson, David McLean, Mary Tyler Moore
1 hour 47 minutes
1961, Essex Productions, distributed by United Artists
Formerly unavailable except by taping reruns on cable channels off the air,
VHS copies currently are offered regularly on ebay.  Most can be located
by searching for "X-15 Bronson" or "X-15 Mary Tyler Moore"
 

X-Planes
Documentary
About 1 hour
1988, Aviation week Video (McGraw-Hill)
 
 

Smithsonian National Air and Space Museum Archival Laserdisc #5
Archive of NASA still images from the beginning of the space program,
includes substantial X-15 material interspersed with other programs.
1987, Smithsonian Institution
1995, The Voyager Company
 

12-inch 33 1/3 RPM

X-15 and other sounds of rockets, missiles, and jets
Includes recordings of  X-15 powered by XLR-11
Probably 1960:  Reprise Records #R9-6003

Several more records will be added to this sectionin February.

Concerto for the X-15
by Carl Prior and Euro Testi
Music from the sound track of the 1961 film, X-15
1964  Ding Dong Music Corp.