Pale said he thought there were already too many topics about launch dates, so we'd probably have to wait until someone makes an official countdown thread (or if this topic turns into one) once a for-sure launch date is officially announced.
We could think up a few reasons now (probably best to keep them to ourselves unless it comes up in normal discussion) and start in a week's time, when it's 100 days to American Thanksgiving. After all, Pale thinks it's a silly assumption to think Nintendo will launch the Wii necessarily before the PS3, but I don't think anyone thinks it could possibly be later than Thanksgiving. Then on the day of the announcement (didn't they say that sometime in September they would announce launch date and price?) we could have a bunch of reasons, not only to celebrate, but to catch up to the true amount of days.
Of the many reasons why I know I want a Wii, what should be #100? *thinks*
EDIT: Okay, here's one. Tell me if you think it's too wordy. (Notice I only mentioned the Super NES - to save the other four known game consoles for four other reasons later.)
#100: Super NES games on the Virtual Console
The Virtual Console allows for the download of classic video games from a number of different consoles. One of them is the Super NES. This 16-bit machine gave us much joy between 1991 and 1996, referred to some as the Golden Age of video games. Nintendo gave us some of the best games of their own big franchises, including Super Mario World, The Legend Of Zelda: A Link To The Past, Super Metroid, Donkey Kong Country, Kirby: Super Star, EarthBound, and many more. Square-Enix had their best RPGs here too, including Final Fantasy VI, Chrono Trigger, Secret Of Mana, and Super Mario RPG: Legend Of The Seven Stars. We still don't know what games will actually be available on the Virtual Console, but we expect some of the best, and some of these games from the Super NES are among the best ever.