I know some hate it, but I loved Star Trek: Of Gods and Men
. I think it's a cute little epilogue to TOS. www.startrekofgodsandmen.com
As for Phase II/New Voyages, "To Serve All My Days" and "World Enough and Time" were enjoyable. The rest... aren't as good, IMO.
(although I loved seeing a live-action Mr. Arex in their latest mini-episode!)
If you like Star Trek: The Animated Series, Starship Farragut: The Animated Episodes is a must-see: www.farragut-animated.com
they're very authentic.