I used to use Haali + ffdshow for h264, but actually just yesterday I turned off the ffdshow rendering for h264, and replaced it with CoreAVCdecoder. And I couldn't believe me bloody eyes (not literally bloody). It must be 50% faster than ffdshow, at least. Now, my computer isn't the fastest thing on earth, so I was rather pleased. Of course that manner of thing actually requires a bit more knowledge and trials than just clicking "Install", so it might be out of reach for n00bs, but any gotwooters certainly would be able to do it, should they ever feel like performing little experiments.
Oh, and #16 got released...
Episode 16 - gg
DVD Picture Book 1 - gg
Edit: Damn, there was a fake episode 16v2 floating around... Now with the official link.