Don't worry. I'm not going to give anything away.
To me, no show has ever fully embraced the concept of "the journey, not the destination, matters," more than Lost. You didn't need to have seen the finale to pick up on that. Not to sound too much like Jacob, but life is not about the situation you're in, but rather how and why you handle that situation the way you do. Lost was a show of ideas and of human nature. It was never, ever, a show about "hey, what's this crazy island?" Those who are arguing over the ending or still questioning "what's it all mean?" will probably never be satisfied, and, sadly, those people completely missed the point of the show. I think it'll be a long time before television audiences are ready to put up with such a concept again, so for that reason, I am sad to see Lost go.
The end of the most novelistic show on television got me thinking of the most outrageous, satisfying, beautiful, or completely infuriating endings to novels we've read. Reactions to book endings usually don't have blogs or message boards devoted to them, so feel free to geek out in the comments.
For me, my favorite last line might be (I'm predictable, I know), "Don't ever tell anybody anything. If you do, you start missing everybody," from, of course, The Catcher in the Rye. I'm also partial to the entire last paragraph of The Mysteries of Pittsburgh by Michael Chabon (which I mentioned before here).
As for "infuriating endings," I think I'm guilty of naysaying. That said, Harry Potter and the Deathly Hallows made me a little mad. First, for people who did die and people who should've died but didn't. Second, for the "tra la la" epilogue. I've heard JK Rowling talk about the book, and I understand why she did it, but when I read it I admit to making my "seriously?" face.
What is your favorite, or least favorite, ending or last line to a book? (Rule: Respect the "spoiler alert" code of not being a ruiner! Thanks.)