1) First steps into raw file processing.
Audio still fails horribly... but PDF files seems to work ok! :D That's just huge.
There's also the issue of big libraries. The PDF library weights 1.5 MB, and had to be called twice. And the sound library choosen also has some fat flash files. I'll have to deal with this, eventually.
About audio: i just need to get the frigging audio duration. But HTML5 keeps giving me NaN or Infinity. I'll have to learn what the hell is going on this this.

2) First steps in Web Workers too.