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Atlasgeo.net: Oman
http://www.atlasgeo.net/flags/anglais/html/Eoman.htm
Animated GIF image.
Flags of the World: Oman
http://flagspot.net/flags/om.html
National, historical, and police flags, and war emblem.
Theodora.com: Flags of Oman
http://www.geographic.org/flags/oman_flags.html
Images in several sizes.
World Flag Database: Oman
http://www.flags.net/OMAN.htm
National flag, emblem detail, and naval ensign, as well as country facts.