A website that accurately told you if you were viewing it through the Wii's Internet Channel or not.
Ancient source made public due to URL expiring and me not bothering to renew it- It's not worth over $17 to me :)
This could be remade entirely with PHP or some scripting of that sort- This is done entirely with Apache rewrites and plain HTML (yikes). Of course, as such this will only work on Apache2.