Links to hacks world be appreciated, and I'm fairly sure Justin Bailey simply did one Samus hack, which he already posted; Zero Suit Samus is apparently what Brawl noobs call it(no offense, kais, I don't even know where you found it.)
As for Shiny Gold, yes, there's development going on, but the author has other things to do, and the remake is a daunting task, so it's going fairly slowly. However, he posted a vid of a new 'minigame' being added in to the hack just a couple days ago, so we know there's something going on, anyways.
Now, for more kickass hax(maybe translations? I might add some must-play translations later, if you don't mind, or maybe branch into a separate topic) :
FF3usHT:
http://www.zophar.net/hacks/files/ff3usht.rar -difficulty patch for FFVI including new spells/items/monsters.
Super Demo World:
http://www.zophar.net/hacks/files/smb7.zip -The predecessor to the above SDW: The Legend continues.