Mine is a Canon S2 - I LOVE, LOVE, LOVE it! I have more fireworks/nighttime pics here:
http://www.mousesteps.com/index.php?option=com_content&task=view&id=23&Itemid=37
That was before I've even learned more about the camera. I wasn't expecting the auto feature to take good fireworks photos, I started with it and figured I'd move to manual (during the fireworks in February) but didn't need to.

I plan to do more later this year, and bring my tripod and experiment as well. This is my most favorite camera ever!
The S3 is now the one you'd be looking at, or the S5 (that is just coming out). That is, if you decided to buy in that series.
Now I'm just working on my leaning issues.

(getting much better, though!)