You will need a sturdy tripod and cable release. Here are the settings I used at the Allen 4th of July Celebration last weekend:
iso 100
f/11-16
bulb/3-10s
MLU
RAW
24-70L (mostly 24-35)
Importantly, setup early and check your settings, focus, and exposure before and during the shoot. Bring a flashlight. Once you are setup, you can ease back in your chair, have a cool one, and enjoy the fireworks show as you click away.
Here are a few from my shoot:
http://www.texasphotoforum.com/forum...ad.php?t=25394