My favorite part of the whole movie is at the end, at the NYE party when Harry says:
I love that after I spend the day with you I can still smell your perfume on my clothes. And, I love that you are the last person I want to talk to before I go to sleep at night.... I came here tonight because when you realize you want to spend the rest of your life with someone, you want the rest of your life to start as soon as possible.
I also love the song "I Could Write a Book" by Harry Connick Jr. "If they asked me I could write a book. About the way you walk and whisper and look."