It looks like FlamingoRich has pulled the plug on Double Rainboom. As a school project, it's life span was limited as is. His new focus will be the True Tail project with Skynamic Studios. I'm sure there are loads of ways to still grab yourself a copy of Double Rainboom for the sake of pony history. Controversial use of memes aside, it was still pretty impressive for a episode length fan animation.
The main Double Rainboom hub site is now adorned with the banner up above. Thanks to everyone that sent it in!