Thats really really really good. It can be so annoying when you take so many photos and only a few are decent but if i eva got a firework one like this id be very happy frame finishes it nicely. What was the exposure setting and did u use a tripod?
Wow that was well gd without a tripod, i must be doing something wrong. Modern digital cameras as far as i know store info in the 'exif' tag or something that is attached the the jpeg and can be viewed under properties for a file. Nevermind if not