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Atlasgeo.net: Macao
http://www.atlasgeo.net/flags/anglais/html/Emacao.htm
Animated GIF image.
Flags of the World: Macao
http://flagspot.net/flags/mo.html
National, provisional, and historical flags.
Theodora.com: Macao (China) Flags
http://www.geographic.org/flags/macao_flags.html
Images in several sizes.
University of Macau: Design of the Regional Flag
http://www.umac.mo/basiclaw/english/p1.html
Image of the flag.