Which game featured the whip? I think I'll hold off on voting because I won't even have Skyward Sword until at least Christmas, but watching my little bro played, the remote-control beetle thing looks super awesome.
Even though I'm not voting yet, I doubt anything can top the awesomeness of the hookshot. So cool. I'm a big fan of the spinner though too, that item felt pretty Metroidy, in a good way. I'd love to see it come back and utilized a little better.
EDIT: Oh [dukar], looking at this list again just made tidal waves of nostalgia wash over me. So many awesome items! Hover boots and the Lens of Truth are a couple stand-outs too. Using the Lens of Truth in the Shadow Temple to unveil ethereal pathways and invisible ghoulish monsters managed to creep me out on a regular basis. [darn], what a series.