Well, since the Yogscast are currently one of the biggest Minecraft players on Youtube, with their adventure maps, their Tekkit and Voltz series and their Shadows of Israphel series (which is MiA, but still one of the best Minecraft let's plays so far). So, this thread is to discuss them, their videos and their casters.
Personally, I've watched every Tekkit episode of the main channel, every Tekkit episode of Duncan, every Tekkit episode of Rythian, and I'm currently working my way through Sips and Sjin. I've also watched the entire Shadows of Israphel series. Great series, although I'm hoping they'll continue it someday.