I just attended an advanced screening of 500 Days Of Summer and was thoroughly entertained. Joseph Gordon-Levitt was absolutely adorable (something I can honestly say I have never thought about him before) and Zooey Deschanel can proudly retain her indie princess crown in a refreshingly original, surprisingly funny, and genuinely wrenching (non) love story (I'm not spoiling anything by saying that). Hall & Oates "You Make My Dreams" was used to perfection and it was certainly fun to hear a song I'm promoting not once but twice in the film too :) The film was made even more entertaining by the sassy black lady sitting behind us that laughed and commented in hilarious fashion to almost every scene. I couldn't get enough of her. I want to have her sit behind me in every movie because even if it was bad, she'd make it tolerable, if not undeservingly good. The crowd at the theater was diverse (say free and I think people would pay to have someone poop on their face it was something that normally cost money), old, young, male, female, black, white, indie, unhip, painfully thin, enormously fat... you name it, and everyone seemed to be wildly entertained. There was even applause at the end.
I see on Rotten Tomatoes the movie has an early 100% rating. I simply can't imagine someone not liking this movie. I absolutely loved it.