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Atlasgeo.net: Liechtenstein
http://www.atlasgeo.net/flags/anglais/html/Eliechtenstein.htm
Animated GIF image.
Flags of the World: Liechtenstein
http://flagspot.net/flags/li.html
National, historical, princely, and commune flags.
Theodora.com: Flag of Liechtenstein
http://www.geographic.org/flags/new2/liechtenstein_flags.html
Images in several sizes.
World Flag Database: Liechtenstein
http://www.flags.net/LIEC.htm
National and state flags and country facts.