Adoption Dates of Flags
A great list of each country's adoption date for their current flag and their coat of arms.

Advertising Flag Company
This company sells U.S. and international flags. Once you click the link for the online store, select "Flags & Banners" for U.S. state as well as international flags.

The Flag Detective
Trying to identify a particular flag? The Flag Detective allows you to view flags based on their characteristics.

Flags of the World
If you're looking for an image of a flag or the history of a flag -- this site is the best. An excellent collection of flags of states, nations, and international organizations.

FlagNews
This great site provides images and information about the latest changes to flags worldwide.

Flags
A collection of U.S., state, territory, and Canadian province clip art flags.

Glossary of Flag Terms
A fantastic introduction to vexillological terminology.

Graphic Map's Flags
Flag clip art graphics for most of the countries of the world, all 50 states, and even a few international organizations.

World Flying Flags
Animated international clip art flags for personal homepages. Pretty neat.