The best I've read to date is probably Wilhelm's edition.
This translation, along with two others (those of Wing-Tsit Chan and Paul Carus), provides the best explanitory introduction of this ancient Chinese classic.
The book is rounded out with 28-pages of detailed chapter-by-chapter Notes, and a brief Bibliography of Chinese and Western sources.
This crappy little book is overpriced and over rated. To make matters worse, the copy that I bought was used. Gigantic ripoff!!!!!Published on June 14, 2008 by Big Dog