Nintendo was the first to integrate motion-based gaming with the Wii, and they will be the first to integrate 3D gaming with the 3Ds which you can now begin to pre-order.
People tend to go crazy during the months leading up to a major console release, so be sure that if you REALLY want on on launch day to pre-order.
A few launch titles will be available with the 3DS from day 1. Most notably:
Legend of Zelda: Ocarina of Time 3D
Mario Kart 3D
Star Fox 64 3D
Professor Layton and the Mask of Miracle
Oddly enough, the price for Nintendo’s 3d hand held has yet to be released, so by pre-ordering you are taking a shot in the dark.