This story can be characterized as "developing" which is a journalism term for, "very little solid information." What we have is a video and a promise for more information when it becomes available. There is a new Wii modchip, named Wiinja, that will purportedly allow your Wii to play backup disks. To install this chip there is the obligatory dismantling of your Wii and some soldering action, but this is territory we've seen before.

The Wiinja site has some more information for you, and this French retail site is selling the chips for a few Euro. I've seen some other sites selling them as well, but none in my beloved English language.

"We've seen plenty of Wii hacks since its November release, and we've even seen a completely uninspiring "hack" to run backup discs, but this time, we're thinking it's for real. The Wiinja modchip is on the loose, and apparently it requires soldering to the Wii innards in order to function, but it purportedly allows for Wii and GameCube backups to be played back on the console. Unfortunately, there's not a whole lot of information beyond that, and there's just a single photo to instruct forthcoming owners how to correctly attach it, but if there's one thing that helps its case, it's the video. -Engadget"