I read Part I ("L'ideologia di Mussolini dal socialismo all'interventismo") in Italian -- Gentile's Italian is gorgeous - and about 1/3rd of the remainder in this translation which was so bad it was unreadable:
In Part I, Gentile demonstrates, through copious quotations from the early writings of Mussolini -- Mussolini himself was an astounding writer -- that Mussolini's early fascism was born from a mixture of Marx and Nietzsche -- an "heroic Marxism" which, under the extraordinary pressures of the War (WWI), exalted the great man and replaced the working-class with the proletarian nation.
If you read some of Mussolini's writings in the original, one appreciates immediately the remarkable energy and genius that inspired a nation -- and, along with a philosophy based on certain false premises, helped lead that nation off the cliff of fascism.
One final point - reading Gregor, Gentile, de Felice, Sternhell -- puts the refutation to the interpretation of men like Denis Mack Smith (http://www.amazon.com/Mussolini-Denis-Mack-Smith/dp/1842126067/ref=sr_1_1?ie=UTF8&s=books&qid=1278024652&sr=1-1), for whom Mussolini was simply a charlatan and buffoon. It is, unfortunately, MUCH more complicated than that.
At any rate, time to remove this from "currently-reading", since I'm not likely to return to it anytime soon.
Though I'm not a great fan of Bosworth -- this book is an excellent introduction, as it presents problems and interpretations (that is, it's an extended and readable bibliographical essay, that places competing interpretations in context): http://www.goodreads.com/book/show/5736665-the-italian-dictatorship
As this book does for Germany: http://www.goodreads.com/book/show/143571.The_Nazi_Dictatorship