Almost Fantasy In The Sky Fireworks
I say almost because although this is the show that Magic Kingdom does for New Years when I took this it was actually on the 30th rather than 31st. I suppose they do this so that if you wanted to hit up another park such as Epcot for New Years celebrations, which I hear is the best show, you would be able to view both rather than just one. Good idea as it allowed me to scope out more locations for the 31st.
This particular shot is a pseudo HDR comprised of one raw file split into 3 exposures and merged in Photomatix.
Looks even better when you hit "L" | HDR tutorial