Ah, the
Star Trek cartoon! I watched it when it originally broadcast in 1973 and loved it! The animation may have been a little subpar, but they were wise to use all the original voices. I remember not having seen it for the longest time, then in the mid 80s, Nick at Nite started to run the episodes and it was a joy to see it again

!
Of course I taped them...and now have the DVDs.
I have heard talk of people wishing that TPTB would give the cartoon the "remastered" treatment and I suppose it would be interesting to see that....
...but if you like the original Filmation style of
Star Trek, then I have a treat for you,
Col. Manning! Starship Farragut (one of the fan film groups) is now making an episode in the Filmation style animation. It will look just like the original cartoon, except the crew is from the U.S.S. Farragut.
You can read more here:
http://www.starshipfarragut.com/