Eri HaKawai is a safe way to enable homebrew on a Wii without hardware modification. Eri HaKawai is achieved by playing a hacked game save for "Tales of Symphonia" which executes a homebrew application from an external SD card. Examples of such homebrew .elf or .dol files can be found on the Homebrew applications page. Eri HaKawai was created by delroth and ported to NTSC by giantpune.
*Copy the "private" folder from this archive to the root of your SD card and merge it with any existing folder. Install the save to your Wii just like any other save game.
*Put the homebrew you want to load (theres a pretty cool one here) on the root of your SD card as "SD:/boot.elf"
*Then start the game, and load the save data. For Jap users, there are 2 different versions of the game. If your game is version "RVL-RT4J-0A-0 JPN" use the top save, if you have "RVL-RT4J-0A-1 JPN" use the second save. if you have any other version of the disc, it probably won't work.
*Once the game starts ( and you see a retarded dog waving at you ), press PLUS to enter the game's menu.
*Scroll down to "Status" and press A.
*Then scroll down to the second character (named "Giantpune"). Highlite him, and press A.
*Hopefully everything works out like it should and the boot.elf is loaded from your SD card.
You must own a game called: "Tales of Symphonia" in order to use this exploit. If you do not have one, you can buy it from here: http://www.play-asia.com/SOap-23-83-ha3w-71-99-49-en-15-Tales+of+Symphonia%3A+Dawn+of+the+New+World-84-p-18-2.html