This is the best OS book i have evern seen, really deserve 5+ starts. It gives many design issues/ideas of real exist OSes which helped me greatly. If you are really interested in OS or do some creative design job, this book is a must see. It seems next edition of this book will be unleashed next February. But what i concern is next editon may be delayed, because there are really too much new things these years, Linux 2.6 ... And I hope next edition will have some introduction to Windows Kernel. I am a UNIX fan, but you see, Windows conquer the PCs desktop, it surely has some shining points