I've been playing Mario Kart DS nonstop since my computer broke (long story). Anyhow, the game does indeed work on my WCG200 and WRK/T routers. I've played very little online, but somehow have amassed quite the losing record and I don't even know what I'm doing wrong. One think I know though, I can never get the quick boost start at the beginning, only get it sporadicly.
Oh, i hope that some of you don't mind if I add you to my friends list like AngelicLulu and Nigel and a bunch of others I'm sure I'm leaving out.
Will find my friend code tomorrow and post it guys.