Nintendo is rolling out the Wii System Menu 4.0 update. The new version gives WiiWare access to SD memory cards, you can now backup games and play them from SD memory cards. SD memory card support has also been increased to 32GB.
The "SD Card Menu" can be accessed straight from the main Wii System Menu 4.0, an update that's being pushed out as we speak, which also enables the Wii to work with memory cards larger than 2GB, all the way up to 32GB -- which should make room for a good many NES carts. Nintendo's also pushing out the new Virtual Console Arcade, which brings old school arcade titles to the Wii.