The Wii has downloadable channels which are all good- but are they? I guess so, but I can think of a few more, which I will tell you:
Friends Channel: Instead of E-Mailing, you can talk to friends exactly in this channel, but you need to have connection with the internet to talk to far away people. You can also make people play games with you if you both have the same game, and if you both agree on what you say.
Cinema Channel: This is simply a channel where you can watch video's downloaded from Wii Shop Channel, but it will need a update first, which I will list down, and more details will be displayed there.
Wii Shop Channel: As I said above, the Wii Shop Channel will need a update to get downloads for movies. You can pick Films, Game Videos, Music Video's and TV Show's. These will be free, for a note of advice.
P.S. This is it, so please comment about my thoughts, and if you really like it, send this note as a suggestion of new Wii Channels to Nintendo.