Once you see what's on it, you might want to pre-order if you haven't considered doing so already.
Online game retailer GameStop has listed the contents of the bonus disc that will be available to those who pre-order Mario Kart: Double Dash. The disc will feature five playable games, seven game movies, and special unlockables for a GBA game. Here's the skinny:
Playables:
- Mario Party 5
 - F-Zero GX
 - Teenage Mutant Ninja Turtles
 - Star Wars Rebel Strike
 - Sonic Heroes
 
Movies:
- 1080 Avalanche
 - Kirby Air Ride
 - Final Fantasy Crystal Chronicles
 - Pokémon Coliseum
 - Quidditch World Cup
 - Spongebob Square Pants: The Search for Bikini Bottom
 - NBA Live 2004
 
Additionally, the disc will feature unlocks for Fire Emblem GBA (available two weeks before Mario Kart), which would require the game and a GBA-GC link cable to take advantage of.
Double Dash and the bonus disc comes out on November 17. Remember, you must pre-order Mario Kart in order to recieve the bonus disc!

