Harry Potter - The half-blood prince

I bought this book when it was first released. I was just getting around to reading it (someone please pick up some on my flist who have now gasped and fainted). Either I have read this book in my sleep (or while "awake" on Ambian) or I have another book bound in with my new book. I swear that I had read those exact chapters somewhere else.

So, those of you with the latest book, would you please list the first 5 chapters for me?

Thanks!