The Wii shop channel lets you buy new channels and games for your Nintendo Wii. Just be prepared to enter your credit card number.
For a shop, the interface isn't very "attractive". Compared to the pretty main screen with its images, the main shop page is rather boring.
From here your two main choices are to go into the download area and to go into the "ware" area. The download area is for downloading legacy games.
List of Available Legacy Games
The Ware area is about getting new channels. Right now there are NO channels available! They say that soon they'll have an internet browser available here.
The other options on the main menu are just to buy "points" so you can buy games. You can buy in blocks of 1,000 points for $10.00. That means a game that is 500 points is $5.
Main Wii Channel Listing