In the course of published academic work almost everything is peer reviewed at some point - books, conference papers, journals etc.. The standard seems to be at least two peer reviews, but more frequently I have experienced three. In almost all cases - the peer reviewers never seem to agree. Some times one person accepts, another rejects, one person likes one element, the other dislikes the same element.
I would be interested in knowing how people deal with the differences often found between reviews.