As a South Park fan, I was delighted to find out about this book. It combines two of my favourite things: quotes and South Park! Yes, it's not as perfect as I imagined it to be, there's a few misattributed quotes and I would have loved to have seen a mention of what episode said quote came from, but, I love it nonetheless.
Divided into 12 chapters or topics, there are corresponding quotes... and it's pretty recent. The most recent quote is from "Breast Cancer Show Ever" which premiered in mid-October 2008 (this book came out less than 6 months later). Within this collection there are funny quotes, quotes that taught me something, and much more!
To me, what makes this book worth whatever money you spend is the Foreword, by Brian Boitano, who has a song named from him in "Bigger, Longer and Uncut" and has an appearance in that short that first started it all (impersonated, of course). He says some really nice and true things about this wonderful show.
Yes, this book isn't a book that discusses the philosophy of the show (read those books, they're pretty good) in depth, and just showcases quotes from the show, with no discussion, but it's still pretty nice.
If you like quotes and South Park, this is a nice thing to have!