This animated version of the Dickens classic, executive produced by Chuck Jones, has a lot going for it. Though short (it's only about 25 minutes), it's considered by some to be the most faithful telling of the story on film. The animation is extremely lush and imaginatively conceived, with startling imagery and compelling transitions. Lastly, it features a reprise of Sim's portrayal of the miser, Scrooge, as well as Michael Hordern's performance as Marley's ghost from the 1951 live action version of the story. I highly recommend this dark and sometimes ponderous version of the tale. Listen for Michael Redgrave's narration as well.
It's somewhat curious that this production has yet to make it to DVD. It has a very interesting history. It was so well received that it was given a theatrical release shortly after it aired on television, for which it was produced. This release made it eligible for Oscar nomination, which it won in the category of best animated short film. This so rankled members of the Academy that it caused rules to be changed about productions appearing on television. Though not on DVD, it is available on VHS. The price is dear, however, hovering around $75. It can be seen in full on Google Videos, and on YouTube, where the resolution is better, but it's broken up into three parts. Part one is above, uploaded by TheThiefArchive.
Obscurity factor: 9 (not on DVD, available on VHS and YouTube, largely forgotten)