Mark is reading The Song of the Lioness! He's only on chapter three, so you have plenty of time to catch up. If you're not familiar with Mark Does Stuff, basically the dude in question reads and watches things that people love, and liveblogs his experiences. If you love a thing he is watching/reading, it can be very fun and rewarding to observe him flipping out over, say, all of His Dark Materials.
Yeah, that one was fun.
And now we get to watch him discover Tortall. A WINNER IS ALL OF US.