iOS 5 has delivered my most anticipated feature: custom text tones. I can finally hear the Super Mario Kart coin ding every time I get a message:

I found a lot of low-quality MP3s of this sound (and the coin sound from Super Mario Bros., which is different). They all sucked. Thanks to BSNES and Audio Hijack Pro, I created a pristine copy. You can download the ringtone file in MP3 or AAC. 1