What is the best Wi-Fi booster to use with the Nintendo Wii?

The Wii uses the same wireless b/g technology found in computers and other electronic devices. So you don’t require anything special to work with the wii. You can see some popular items here at newegg: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=wirelesss+extender&x=0&y=0

As you’ll see wireless extenders get pretty expensive, so before you start forking over $150 for an extender, you might want to try Improving your WiFi reception: http://www.wikihow.com/Improve-WiFi-Reception