Nintendo launched a new system update for the Nintendo Wii bringing SD card access support.
Now you can store and manage games and other data stored on SD and SDHC cards.
you can now extend the storage capacity of your Wii up to to 32GB and launch WiiWare titles, Virtual Console games, or channels directly from an SD/SDHC Card.
You can also move games and channels to an SD/SDHC Card with Auto Manage when the Wii system memory fills up.
Wii Menu 4.0 is available for download on your Wii console.
Via the Nintendo site.

Nintendo also confirmed that the company has now shipped over 50 million Wii consoles world-wide. The Wii has in solid supply in the United States for weeks now.