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Butterflies of North America
This well-designed site allows you to select your home state from a map of the United States and provides you with a very detailed list of butterflies native to that state, as well as an accompanying picture. Information includes which plants each butterfly is attracted to, which should be useful to the butterfly gardener.
This commercial site is poorly designed and difficult to read. It contains some of the same information as the Butterflies of North America page, although it's not as detailed. About the only reason you might want to visit this site is for the online store. If you're looking to have a butterfly launch at your next Big Event, this it the place to make it happen.