You've probably heard that the Chinese guild Stars has pulled off the world-first Alone in the Darkness, killing Yogg-Saron with no watchers helping. You may have seen the video they posted of their winning strategy. But here's something even more interesting, for me: a Q&A with the guild about their strategy and their experience with the fight.
It was originally in Chinese, but a poster on the MMO-Champion forums did a translation. It's a really interesting read. For one thing, Affliction Warlocks turned out to be the most valuable class, since DPS have to turn away periodically in phase 3 to avoid Lunatic Gaze and a heavy DoT-based class doesn't lose as much doing this.