I sold mine a while back but the wii has been totally hacked. When I say totally hacked, I mean not only can you copy games (which is really lame) you can also run unsigned code, which means theres already some homebrew software ready to run on the device. Emulators for the Wii have also moved along really quickly and now you can play Wii games at a higher resolution that the Wii's hardware. Aka you can play some Wii games at 720p resolution rather that 480p. It really feels like the days of hacking the Xbox but with the console online, and it coming out of the box with SD, USB and Bluetooth, I can't wait to see what interesting things get built. Might have to end up buying another one if things get really interesting. XBMC for wii anyone?
There's a ton of links but the best place to start is simply Wii Brew and Dolphin-emu. I found out about the whole thing by watching the video podcast Hak.5 ep's 508, 509 and 510. The show is also now in available in HD which is actually pretty cool for seeing code samples clearly. This is also why I download Coop in HD.