Jay, I used 200-250 ISO, and aperture ranged between 16-22, exposure anywhere from 2-10 seconds with 18-200 lens and tripod, used timer mode (had to get really lucky this way) but eventually got a cable release.
As for editing, lots of cropping (since fireworks refuse to go off in the same spot consistently) and then I punched up the saturation and vibrancy, also played with the contrast to help darken the sky and reduce the smoke.
Basically still experimenting, shoot 150 shots and share about 10-15.
These pics were from 3 different shows.
Well done. Were these all done with the same settings? Did you do any editing?