I basically attempted to construct a full version of the opening song using parts of the anime etc... I might do an upload and post my original. Sadly, SOOO many people are posting extended mixes on Youtube claiming to be their work when it was really me... sadly that's probably why I stopped attempting to improve my mix at some point, I got tired of people rebadging my mixes and uploading it as their own.
I'll let you in on a secret, I also did another extended mix beyond the final version most people know of, but I only shared it among a small circle due to the reason above :).
EDIT: Here's a rapidshare of the original final mix archive that also contains a larger version of my avatar as a wallpaper - I have an even larger one but decided it would be overkill to release it:
http://rapidshare.com/files/24655292...Final.zip.html