I believe we all got spoiled something while we were reading the books. I'm interested in what you got spoiled and what was your reaction to it.
I got spoiled the RW partially, I knew Robb was going to die at the Twins (wiki family tree ) but Cat's death was a surprise and it still pretty shocked me. Also, I knew Robb would marry Jeyne Westerling.
I was watching a clip from GoT on youtube while I was reading ACoK, something about Tywin, i wanted to compare it to the book. A comment under the video said something like - 'too bad Tyrion gets killed in the privy, I'll be pissed if he gets killed in the show, he's an awesome actor' - too late did i realise i read it wrong and i spent 2 books not knowing when Tyrion will die. Not to mention I was surprised when it was Tywin who died in the chapter, i actually thought Tywin would kill Tyrion from the privy.
From the promo posters and stuff i got Dany's dragond spoiled, as well as 'Joffrey is the evil king'. Wasn't surprised when Robert died at all.
I got the KL riot spoiled too although I thought it would just be a minor thing, not the let's-kill-the high septon-and-eat-him sort of stuff. After the RW I got Lasy Stoneheart spoiled but I liked when it happened nevertheless. And Jon's "death" - it was very anticlimatic knowing it would happen. Everything else blew me away naturally.
How about you?