This weekend is sure to be a blast. ( groan, I know)
Here is a post from last year with fireworks photo tips... and of course, if you Google it, there are a lot of other informative articles out there.
The key for it all is to find something other than fireworks to include in your shots. Fireworks alone are pretty, but get repetitive quickly. People, especially expressions, reactions or any emotion can make it a great fireworks photo. Easier said than done, but that is my goal this year.