Plug in any SATA hard drive or CF card (or IDE drives with a $2 adapter), then plug the SunDriver into the Wii's DD ribbon cables. Plug the Sundriver via USB 2.0 into your computer, drag across all your ISO images (Trimmed works, too). Unplug, turn on the Wii. Now, the best part: It boots to a custom menu automatically, bypassing the Wii menu (Which is still accessible through the SunDriver menu), and use the sync and reset buttons (Which are remapped for just this menu) OR A GAMECUBE CONTROLLER to go up and down the list of Wii or GC games and select one. It launches perfectly. Emulates the drive at 8x, current compatibility is 100%.
Google for moar info. $70 USD.