Peter Freestone and David Evans, Freddie Mercury: An Intimate Memoir (2001)
It's no masterpiece, but it's a nice view into the life of Freddie Mercury from his longtime personal assistant.
Phil Sutcliffe, Queen: The Ultimate Illustrated History of the Crown Kings of Rock (2009)
This beautiful book is a great textual tribute to Queen, and fun for the fan and even for the uninitiated.