Finally got my hands on a Wii and Mario Kart Wii after holding out for months until the launch date. I'm a massive fan of Mario Kart and hammered the DS version to death. The Wii version has a more robust online play and some of the tracks are fantastic (Maple Leaf is my current fave).
So I throw down the gauntlet to any readers with a Wii and Mario Kart, my MK friend code is: 2148 8301 0963 — drop your MK friend code in the comments below and I'll see you on the highways of Mushroom City!