Well, word on the street (and an unconfirmed word!) is that Wii will also be utilizing a Friend Code system. While this is not surprising, it seems as though Nintendo took a bit of a hint and reduced the Friend Code to being system dependent only. It's unclear whether a different code might be generated for different user profiles on an individual Wii, but at least we can memorize the digits as we would a personal phone-number.
"Check it, man, I got her digits."
"Sweet, you can play her tomorrow on Brawl."