Seems like the series is just flying through the book. It's been a few years since I read the first, but I want to say the stuff with the butcher's son was pretty deep into it, along with the consequences. I guess that's what they need to do, though, to get to the meaty parts later in the book.
If the Butcher's son is the part I think it is (events occuring during the trip to King's Landing) - that happens in the first 250 pages of the book.
I watched episode 2 last night. I was able to get a 3 month subscription for HBO for only $5.99/month. So I will take advantage of that for as long as I can.
Anyway, I did enjoy it a lot. As with most screen adaptations, there is always somethings that they change and you scratch your head why? However, all in all it's been very faithful to the book.
Since I am still reading the book (150 pages to go), I had it right next to me when I was watching. I flipped back to see where exactly they were and it turns out the last scenes (with Anya and the with Bran) are around page 135. Which is almost exactly 20% of the book - so it looks like through 2 episodes, they are paced almost the same.