There are two ways to take apart the Wii. The first, as demonstrated by Popular Science, involves breaking the Wii open due to a lack of tools. The second method is a more formal Wii disassembly guide, which is provided by InformIT.com. Either way, you can see some detailed pictures of the internals of the Wii and how the parts are laid out. The InformIT.com version also includes an eight minute teardown video.
If you want to see what the Wii looks like inside out, here’s your chance. It’s amazing how much they pack into such a small space.