This is an example of people discussing books, taken from podcastsinenglish.com. The title is "A good book". Although not a review as such, it's got good examples of the "general comments on the book" part of the review.
Brookline book reviews offers you reviews by some students in public schools in Brookline. You can listen to them all, as they come in mp3 format. However... they're students who speak rather fast, which may be a bit too difficult for you, so take it as a challenge.