I happened to notice another Kingdom Hearts fanvid in the sidebar.
URL in case that didn't work: Kingdom Hearts Random Crap: The Musical (Spoiler warning)
Some bits are better than others, and they need to fix the volume of some songs to match the rest, but there are parts of it that had me hooting for oxygen.
My favorite is Demyx. The Clueless Trio saying "Hello nurse!" to Auron is also...um...something. O.o ;;