Prototype
Here are some screenies of the prototype version of Mario Kart DS. Click here for beta videos of Mario Kart DS!
If you look at the screenshot above, you'll notice some differences between that version and the final version. The time and lap text is different on the touch screen. The lap in the final version is shown on the top screen in the top right hand corner. Also there is no speedometer in the bottom right of the top screen in the final version.
This is more like the final version. However in the final version the bottom screen's background matches its corresponding cup. As an example if you played a track from the Mushroom Cup mushrooms would appear in the background. This track appears in the mushroom cup yet it has stars.
Another difference is the logo. The first image below was an image streaming around the web as the official Mario Kart DS logo.
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However when the boxart was released it appeared that the second logo was the official. Many people didn't like it, but some did, mainly because it is not like the other Mario Kart logos at all. It doesn't seem like a usual Nintendo logo.