It was announced at GDC 2009 that Wii Menu 4.0 is currently up and available.
This new firmware update no longer makes Wii owners shoehorn their nintendo software and channels onto the paltry internal memory nor have to deal with only slightly-less-wimpy 2 GB SD cards.
Nintendo has officially opened up the SD card slot to permit much larger SD cards such as 4 GB, 16 GB, etc. Also, with a new icon on the Wii Menu, transferring channels and software between the SD card and the Wii's internal memory is much easier.
Thanks Nintendo! Click HERE to check out our report on the entirety of Iwata's keynote address.
GDC 2009: Nintendo Announces Wii Menu 4.0 and Wii Storage Solution