Just grabbed myself a couple games that are wifi enabled. First and by far my favourite is tetris DS, with Yu-gi-oh world championship 2007 coming in a very close second and mario kart in 3rd (although I cant figure out where I've placed it :S).
Looking for people to play these games regularly with over the wifi connection especially for the yu-gi-oh game . just send an e-mail to email@example.com, you can also use that address to get a hold of me on MSN messenger.
hope to hear from some of yas soon .