Commander Courage said:

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

I'm not quite sure which one would have worked better. That is a nice scene, but I don't exactly feel like it's originally attached to the best of episodes (Requiem for Methuselah).