To all of you people here, listen to Erica. Because she is right, and I know this first hand because I don't have a Wii.
I got home from church around 1 pm. I called 10 stores (4 Wal-Marts, a Target, 2 EB Games, a Circuit City, a Toys R Us, a Sam's. That is every friggen store in a 30 min drive), every single store I called I got a "We're sold out" when I asked about the Wii. So you people (who is out of North America) who didn't get a pre-order, and if you want it launch day then you make sure you line up for it the night before.