I don't know if the mirror shield was supposed to go under "shield" or not, so I just voted for "other." Anyway, I vote for the mirror shield from Ocarina of Time/Majora's Mask/Wind Waker. It just looks badass and it's fun to use. After the mirror shield, my favorites are probably the hookshot/longshot or the Biggorons sword.
Edit: by the way, this probably should have gone in the general gaming forum.
You know, I just invisioned playing the new Zelda on the revolution and using the boomerang. That would be awsome to learn how to fling the remote(not let it go of course) and us it as your boomerang. Then when it comes back to you, a violent rumble occurs when it hits your(link's) hand.
That would be just too cool...and probably the only way I would ever get a boomerang to come back to me. Has anyone ever done it in real life?
The medallions in Link to the Past? I never even use those things unless I have to (just like the spells in Ocarina of Time). The boomerang is always fun, but I was kind of disappointed that you didn't get to use it much in OoT. Can't even use it as an adult, which is pretty dumb.