Stop Motion animation made a brief comeback in 2009 with films like Fantastic Mr. Fox and Coraline. Although there was a considerable amount of CG involved, it was still stop motion nonetheless. In August 2012 from the creators of Coraline, Laika (a CG film company) will release a new film called ParaNorman, WHICH WILL BE AWESOME. So, welcome back Laika AND stop motion.
Along the lines of stop action animation, a gorgeous short was released by Zealous creative. Their piece Zero is an excellent and pretty much flawless piece on this studio's part. I look forward to what these guys produce in the future.
And lastly, from the internet stop motion master, this famous piece is a perfect example of the capabilities of incredible 2D animation.
There you have it, stop motion awesomeness!