There are a couple of good reads out there and a perfect one is "That'll Never Work", success stories from private irish business that covers stories relating to the success of Treasury Holdings, Aer Arann, Celtic Bookmakers Smarthomes etc. The great thing about each story is that it is written/told by the founder of the company. Each tale is about 10-20 pages long and is quite captivating. It is relatively new and quite fresh.
The other few that spring to mind is Frank McDonalds book on The Builders, though not specifically about Business it does reveal how the business of properpty development works and goes through all the major players (Liam Carroll, Johnny Rohan, Bernard McNamara etc.). Interesting perspective and quite up to date too.
I would definitely consider the books on Michael O'Leary and Ryanair as they are compelling reading and the vignettes into his personality and robust approach are worth it. There are two on the market one by Alan Ruddock and the other by Siobhan Creaton.
Another old chestnut by the grandfather of Irish business (at this stage, anyway) is Crowning the Customer by Fergal Quinn. He did get out of Superquinn at a great time and the principles that brought him to that stage are outlined in this compact and fab book.
Hope this helps....