Star Trek is my first true geek love, so I'll have to go back and peruse through this entire thread but in the meantime, check out this extended ending to "The City on the Edge of Forever" that I ...found. ;)
"The City on the Edge of Forever" Extended Ending:
http://www.youtube.com/watch?v=plbmvkxpl5o&feature=share&list=UUeLdyZnPg-3ldU8R_NU-sMg