Nintendo has stated on multiple occasions that they will have voice enabled chat in the future so trust me my man it is coming. However for now, the best option is to use Skype. That is why we have a Skype name thread on here so people can add one another and I always use Skype when I am playing my friends. So that is the best you can ask for right now. Plus if Skype is good enough for our podcasts, its good enough for chatting during gaming hehe. Even Reggie said that for right now people should use Skype until Nintendo does come out with voice chat.
That seems like a very unlikely alternative, seeing as the other slots would be better suited and convenient. I don't think it would be even remotely possible to use the SD card slot.
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{Spur of the moment Toad Mario Kart poem below! lol it is bad!}
Spoiler
Everytime you race as Toad
The noobs begin to cry
They know they don't have a chance
Toad will simply fly right by
The only thing about those USB ports is that the wii is very small. A small yank of a person's head in frustration could lead to the whole wii tumbling down (no I don't keep mine on the floor) which would lead to lots of damage. I would like a wireless adapter similar to the wireless gamecube controllers that would be able to pick up the signal of a wireless headset.
Fox64 meant a wireless headset in the usb port, like a wireless mouse.
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I BE OLD SKOOL...