I thought I'd fire off some quick tips for shooting fireworks this weekend.
It is universally recommended that you shoot from a tripod if you have one. If not, a bean bag makes a good portable something to stick your camera on that will conform to the shape of your camera and help to hold it steady.
A good place to start with settings is to set the ISO to 200, aperture to f/8 and shutter speed between 5 - 15 seconds. If your first pictures are too bright and blurry, use a faster shutter speed. When the time comes for the grand finale, change to a faster shutter speed than you have been using. This will compensate for the brighter skies that will be lit up by the extra color.
Here's a link for more ideas:http://digital-photography-school.com/how-to-photograph-fireworks