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Atlasgeo.net: Estonia
http://www.atlasgeo.net/flags/anglais/html/Eestonia.htm
Animated GIF image.
Flags of the World: Estonia
http://flagspot.net/flags/ee.html
National, governmental, municipality, and historical flags.
National Symbols of Estonia
http://www.einst.ee/publications/symbols/
History of the flag, its colors, the coat of arms, and the national anthem.
Theodora.com: Estonia's Flags
http://www.geographic.org/flags/new3/estonia_flags.html
Images in several sizes.
World Flag Database: Estonia
http://www.flags.net/ESTN.htm
National flag, naval ensign, and country details.