AngieW has an interesting post at Romancing the Blog.

A Question of Credibility

It touches on a couple of things but two that caught my eye were:
1: amazon reviews and requesting them to be removed
2: is it possible to fairly review a book written by a ‘friend’

Great blog with some interesting comments… of course I do like AngieW and link to her blog so take my opinion for what it is worth ;).