Charge Station Quad

Keep all of your Wii Remotes™ charged and ready to go with Nyko’s Charge Station Quad for Wii®. The Charge Station Quad includes 4 NiMH batteries, exclusively designed for the Wii Remote, and each providing up to 25 hours of play time. Every battery is easily recharged by placing the Wii Remote in the charging dock. The charging dock conveniently plugs into any standard wall outlet, allowing for rapid recharging of all four batteries simultaneously. The Charge Station includes 4 differently colored custom battery covers with contact pass-through points so you can charge the batteries while they are still in the remote. Each battery cover is also rubberized for superior grip during intense gaming sessions. The Charge Station Quad matches the décor and styling of the Wii, and is perfect for parties, tournaments and family game play sessions.

http://www.nyko.com/products/product-detail/?name=Charge+Station+Quad

I havent got a quad charger, but do I have a dual one and i’m sure by now(6months) it has paid for itself in replacing the batteries.  mine cost about $30~ from memory

next up is the nyko perfect shot

Get into the game like never before with the Perfect Shot for Wii®. The Perfect Shot is ideal for shooting games on the Wii and is fully compatible with all software designed for the Wii Zapper. The Perfect Shot is designed for one handed operation, giving a pistol-like grip for all your shooting games. The accessory pass-through port also allows for use of Nunchuks™ and other accessories while the Wii Remote™ is docked in the Perfect Shot. The tactile trigger also provides a smooth, natural activation of the B-button for less hand strain.

http://www.nyko.com/products/product-detail/?name=Perfect+Shot

Until now, the Internet Channel was available to download from the Wii Shop Channel for 500 Nintendo Points. However, as Nintendo encourages all customers and their families to enjoy browsing the internet from their sofas, the Internet Channel can now be downloaded for free!

To download the new Internet Channel, simply select START at the lower right of the screen. This will take you to the Wii Shop Channel, where you can download the software.

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Quick Start

When the countdown starts wait till the 2 starts to disappear and then press and hold the 2 button. So the 2 must still be visible but disappearing.
This will give you a boost at the start of the race.
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Boost when recovering from a fall

When you fall into something, such as water or falling from rainbow road, when you land, if you hit 2 at the moment you hit the ground, you get a temporary boost.
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POW Block Immunity

When you see the POW block on your screen and its about to hit you, just do the function you would normally use for a trick to create a shockwave for youself to become immune to the spin out the POW block creates (Control panel on GCN controller, Shaking Wii wheel, etc.). This can be done on both bikes and carts. Even though you don’t loose speed or spin out, you still will loose the items you were carrying.
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Change Mii Racer weight class

Go into the Mii Channel and change your Mii drivers weight, which will have an in game impact causing you to change weight class and have different cars.