Penguin has a long history of amazing book cover design, but the work by David Pearson indubitably tops my list.  His covers for the “Great ____” lines by Penguin are quite possibly my favourite covers of all time, but is that of any surprise?  They are clean and minimal in execution, centre heavily around typography, and make fabulous use of colour.

[img from boingboing.  more by pearson on his website and flickr.]