ios249 is a sweet little hack for the Wii that allows you to play backup burned copies of games on your console. Pirated games will work too, although we DO NOT condone piracy. This video will walk you through the whole rather elaborate process of installing it on a hacked Wii with the Homebrew channel. You will need to download a whole mess of free software:
these wads (Don't have you Wii connected to the Internet when you load those)
Now get all that onto an SD card and get started!