Oh, I somehow forgot Link's Crossbow Training. That game is pretty awesome, though short. It basically uses the Twilight Princess assets to make a lightgun shooter. There are also some 3rd person shooter levels where you move Link with the analog stick as you aim and shoot, and I must say Zelda works very well as a 3rd person shooter.
The best part is the Darknut boss (level 7-3 I believe) which is one of the 3rd person shooter levels. It's a fun boss that sometimes splits up into a barrage of bats, flying around the room as you shoot them, forming back together into a Darknut elsewhere.
The Wii had some crazy plastic peripherals that were for the most part nothing but decoration (remember those tennis rackets and golf clubs for Wii Sports?) but that gun peripheral is by far one the best of them. Makes light gun games so good. I haven't tried the official Wii Zapper, but I like how this gun shell doesn't mandate the use of the Nunchuck. It also has the expansion port on the bottom of the gun for if you do want to attach a Nunchuck.