We’ve been clamoring for it for a while now (since the Wii’s release two years ago), and Nintendo’s finally given in – come Spring 2009 we’ll all be able to use our gratuitously sized SD cards that have been sitting in our Wiis to their full potential. You’ll be able to move your channels to the SD card and use them – including games purchased over the Shop Channel. I expect Nintendo will be taking measures to prevent you from simply giving your games to other people, or else there’ll be some mass game transferring between friendlies.
Supposedly there’s a 2GB limit to the storage you can use, and I’m currently not sure whether or not you need to buy a Wii-branded SD card (which would make sense given a limit). If so, expect this solution to take off more slowly than you’d have hoped – about as slowly as it takes for your wallet to fill up $80 in surplus cash.
UPDATE: As commenters are poiting out, the chances of Nintendo requiring a Wii-branded SD card are highly unlikely, as the Wii has supported all SD cards from the beginning, and there is no special format specifically for Wii (the only difference between SanDisk’s Wii SD cards is that they are white).