Though we've only played through about an hour of Diddy Kong Racing DS's racing progression, we'll note that the early portion doesn't quite offer the same sense of speed as Mario Kart DS does. This might be attributed to the fact that Diddy Kong Racing DS's engine runs at a casual 30 frames per second rate while Mario Kart DS flows at twice that. Diddy Kong Racing does, however, give players the ability to upgrade their vehicles, so we're expecting that as we get through many of the easier challenges that the faster crafts will make themselves available.
We still have much more to play in Diddy Kong Racing, so we'll be updating our impressions over the next few days, including our experience with some of the mini-games as well as the multiplayer functions. Diddy Kong Racing DS features five-player internet play, one more than Mario Kart DS. Check out some of the single-player modes via screens and video by hitting the media links below.
-IGN
http://ds.ign.com/articles/758/758015p1.html
It's not 8 bul... the back of the box says 8 player wireless, thats not the same as online. : (