WiiPower said:
I recommend using Gecko OS for your import games. For that you need the Homebrew Channel installed. And to install that you need bannerbomb. So follow that guide and stop after installing HBC, then get Gecko OS on your sd card and boot it from HBC.
That is the safest method, but it's very annoying to use (in my opinion). Launch Wii, go to HBC, launch Gecko, launch Game...I would only do this if you want to be 100% save. And you have to install HBC, which you maybe don't want.
If you aren't feared of messing (a bit) with your Wii and have an good TV that can play the Signals without any need to force a Videomode, I would have a look at
Startpatch. It patches the Systemmenu permanently*, and disables the Region-Checks, so you can play your Imports like normal games from the Disc Channel. It's pretty clean, in my opinion (since you don't install HBC, and you only need to run it once).
*If you'll update to a new Menu, it will be gone, and you can also remove it manually from the App.
So I would get
Bannerbomb, run the Startpatch.dol, apply the Region-Free Hack, and enjoy. But everything at your risk...