As the 4th of July is just two days away I wanted to provide a few resources that will walk you through how best to photograph fireworks.
It really is much easier than you might think, with the most important tool (other than the camera itself) is a tripod.
So here are the links:
National Geographic - Photographing Fireworks
Digital Photography School - How to Photograph Fireworks Displays
Free Digital Photography Tutorial Site - Firework photography
Mason Resnick- Take Pictures of Fireworks You Can Be Proud Of
And to wrap it all up here is a short video from the Photo Tips podcast (a great resources for all things photography), in this video they will walk you through photographing fireworks (and the people watching them) from the initial setup (with detailed camera settings) to tweaking your setup and settings during the shoot.