Top 5 things I'm looking forward to on the Nintendo Wii
In no particular order
Virtual Console
Who doesn't want to be able to play classic games.
DS Support
The possibilities are endless. Use the DS as a controller for the Wii or maybe simply as a secondary display device. Use the Wii as a gaming hub for the DS. You could download demos to the Wii that could be shared with the DS via Download Play. Use the DS to further explore worlds for a Wii game (maybe special levels you can only get to with the DS). I could keep going.
Backwards compatibility with GameCube
I would love to play all the Mario Parties that came out on the GameCube or my favorite the Prince of Persia series. The Wavebird is a great wireless controller and would work as well.
Wii Remote and Nun-chuk controller
Just go watch any of the videos on You Tube to see just how awesome this controller is going to be.
WiiConnect24
Finally, some true Internet loving from Nintendo.