It's ironic that I should have read one of Dawkins' earliest works after reading his newest - doubly so given that the quality of the former eclipses that of the latter by a substantial margin. The Selfish Gene represents Dawkins at his very best: lucid and witty without ever sacrificing his intellectual rigour, he presents his arguments with an unassailable logic that precludes disagreement. Perhaps it is a cliché, but everyone who has an interest in Darwinian evolution should read this book.
That said, there are times when Dawkins belabours some of his points unnecessarily and, occasionally, over-indulges his proclivity for observing the niceties of academic modesty, but the prose never ceases to sparkle and these minor issues really are the harshest criticisms I can muster! The 30th anniversary edition has been updated with some insightful endnotes that enhance (but not interrupt) the original text and bring The Selfish Gene up to date, making it a worthy addition to any library collection.