Yep. I've been on a personal crusade to convince people who usually wait for price cuts to jump on this at launch, because that's the make or break time for any console. If it isn't a huge success at launch third parties will cut back support. Fewer third parties means fewer games which means fewer people will buy the Wii in the future, which comes around again to 3rd parties cutting even more support, which leads again to fewer people buying the Wii, etc. etc. etc.
Nintendo has taken an enormous risk, practically betting their existence in the console hardware market on this one device. Few companies that size would be willing to risk their company on such a revolutionary departure from the status quo, which is why Xbox 360 is Just a faster, prettier Xbox and PS3 is just a faster, prettier PS2. As gamers, unless you want to be playing the same old rehashes over and over again for the next ten years, you owe it to Nintendo to make the Wii an enormous success.
Preorder. Pick it up at launch. Imagine the games that are possible with that controller that will never be made without major 3rd party support. Imagine Fight Night, Star Wars (light saber melee), Tenchu (grabbing someone from behind with the nunchuck and slitting their throat with the remote), Tiger Woods, etc. Name me any game and I could throw out an idea for control that would put a gamepad to shame (with the possible exception of the standard fighter).
Buy this thing at launch. You can feel good about it if you consider that it'll cost no more than 2/3 an Xbox 360 and 1/3 of a PS3, so just pretend that it's been out for a year and a half already and that's why it's so much less expensive than it's competitors.