I've read "Time Bomb" and "Parlay Family Fortune" a few yrs ago. Very educational and w/ detailed examples about RMDs and stretch IRAs. I just saw him on public TV last night and he basically was talking about the same things so I imagine his newest book is probably similar........I was going to suggest that your father just borrow the books from the library but they seem reasonably enough priced so if you don't have any other ideas for gifts,they would be ok.
Amazon.com: Ed Slott: Books
If Amazon still has the deal going, you might be able to sign up for an Amazon Visa card and get $30 free credit so the book (and more) would be free. It probably is as important for you to read it as for your father since successful implementation of the stretch IRA depends your actions being correct as much (or perhaps even more) than what he does. Ed Slott has a website irahelp.com Ed Slott America's IRA Expert
and a forum there where you can ask questions.