Awesome news :)
For the mp3 demo, what is the song encoded at? Also, is there a way to listen to the same tracks encoded with the various encoders to compare? I come up with my own encoder / decoder a few years ago and ran a MUSHRA test against various other popular codecs; I wish I had this tool back then!
It is 128kbit in the MP3 demo, I think I used LAME to encode it, but I am not sure, could have been the one in OS X. It plays 320kbit files fine though.
It sounds really bad in Chrome on Ubuntu 12.04. Choppy, I don't think the speed is right, etc. I didn't see a link to the original, though, so it might be just really crappy music.
Chrome and Ubuntu have been having both HTML5/Flash audio since early this year unfortunately. It's rare that I have any audio played correctly via Chrome regardless of the source, it sounds corrupt and plays at the wrong speed most of the time. Suspicions are PulseAudio. You can try killing it and reloading the page and trying again (you may also need to restart Chrome).
https://astrid.com/home/export
As for alternatives, Google Keep is pretty great for your basic todo needs:
https://drive.google.com/keep/