The Directory of State Laws for Consumer Fireworks from the American Pyrotechnics Association is a great fireworks law resource for people located in the United States.

The Michigan Fireworks Safety Act of 2011 (MCL 28.451), changed Michigan's fireworks law to allow the purchase and use of all types of consumer fireworks. The use of bottle rockets, roman candles, firecrackers, aerial shells or mortars, multi-shot repeaters and other types of consumer fireworks is legal in Michigan.

A great resource if you are looking to go deeper into pyrotechnics and the chemistry behind the beauty. The Journal of Pyrotechnics Archive is a wealth of technical knowledge on pyrotechnics, including fireworks, pyrotechnic special effects, propellants and rocketry, and civilian pyrotechnics.

A monthly magazine with all sorts of information for the hobbyist pyro. Many fireworks books and videos are available from AFN.