There're tons of goodies awaiting.
Nintendo has recently updated their web page for Super Mario 64 DS. The site is now fully available and it loaded with tons of information on the game. Each of the four characters (Mario, Luigi, Wario, and Yoshi) has a profile detailing their special moves, attributes, and minigames. There are tons of movies that show off each of these character features. Some of these videos showcase brand new abilities and areas. Also included is a video of a four-player match, which looks like a ton of fun.
There are three wallpapers hidden on the website, and they can be found by clicking on the DS buttons on certain pages.