I've modded my DSi, so now I can play Newer Super Mario Bros. DS in the highest possible quality.
The DSi XL is probably one of the best ways to play DS games, as the method the 3DS uses for upscaling DS games blurs the image, and makes the colours washed out.
Who is your favorite character in Crash Team Racing: Nitro Fueled? I'm pretty sure you can guess mine, but I got the game just so I can input controller combos so I can play as Penta Penguin from the getgo. Penta's best color scheme is the blue jay one, and I want to get the Ninja Penta. Yay penguin yay one!