Three more to add: M&A Titans - about some of the legendary dealmakers in Wall Street's golden era, and Deals from Hell: M&A Lessons that Rise Above the Ashes(especially relevant for future Darden IB's since it was written by a Darden prof.) - case study about 10 of the worst deals of all time. I thought the first was outstanding, and the second I'm in the process of reading. I'll edit the first post to give my thoughts when I am finished.
Also, the last book I'll recommend as a sort of encyclopedia of deal making is The Big Deal by Bruce Wasserstein. The book is loooooooooonnnngggg (like 1,000+ pages), but provides a history of deal making by industry from the 1950's up through 2001 (published in 2002). It's amazing how much M&A shaped many of the familiar brands we know today. Then, the second half of the book chronicles how a deal gets done and who the main players are. I would recommend this book for anyone that wants to be a dealmaker.