Odds are right around 100% that you've used the burgeoning unofficial Bangai-O Spirits level database -- even if you've never played (or heard of) the game. One player (that we've seen) has turned to YouTube for hosting and sharing of levels and replays. Immediately, Treasure's bizarre decision to make level data into sound files makes sense. YouTube is easy to use for both uploaders and downloaders, and all you have to do is hold an earphone up to your DS's mic to download a level. Other Japanese players are making use of Japan's YouTube-like site, Nico Nico Douga.
This video demonstrates the process. It's also amusingly meta, in that it's a YouTube video that shows someone downloading and playing a YouTube video. It's a better alternative for a blog than just embedding one of the actual levels, since there's no screeching involved.
