Book #5 of 2012:
Ready Player One by Ernest Cline.
I'd heard a lot of buzz about this last year from various sources and now I know why. I really really liked it and have a feeling it'll make a "Favorite Reads of 2012" list, if the world doesn't end in December AND I actually make myself write the list this year. It's the first book I've read in awhile where I was really excited to read it--"Oh crap, I have to get out of bed? Dammit. Wait, but I can read on the train!!!"
The general premise here is that it's the fairly near future (2044), and the creator of a massive online universe where everyone basically spends their entire lives (called the OASIS) has died. His will stipulates that whoever finds three keys, unlocks three gates, and then finds the Easter egg hidden in the OASIS will become his heir. Five years pass and no one has made progress, even the massive corporation that wants to find the egg themselves in order to monetize the previously free OASIS, but then our protagonist finds the first key, and all hell breaks loose.
It seems like most of the people who dislike it think the references are too much, but in the context of the story, they make sense. Does it make a SHITLOAD of pop-culture references? Yes. Does that make sense as part of the story? Yes. Are they all seamlessly placed? No, but nothing's perfect.
Cline is not the best writer. He's probably not destined to be remembered in a century or two for his lasting prose. But that didn't make the book any less enjoyable for me. Some negative reviewers have said that the book should be targeted to young adults. I've been known to read a young adult novel from time to time, so maybe that's true, but again, doesn't mean it's not enjoyable or even valuable as a book.