I read Unintended Consequences at least once a year and I tell everyone to read this book!
As far as books I like to reread a lot
Atlas Shrugged,
everything and anything by H. Beam Piper,
Glory Road, Starship Troopers, The Cat Who Walks Through Walls, I Will Fear No Evil and just about anything else by RAH,
Freehold by Michael Z Williamson, which I also tell people to read
The March Upcountry series by John Ringo, I jump on his Council Wars and Legacy of the Alldenada occasionally and I recommend his Bolo Novel "The Road to Damascus" where a sentient tank discovers it has been oppressing the people.
The Mutant Chronicles books are good brain candy too.
The art of War and the Book of Five Rings I not only read but I keep pocket books versions in my carry-bag (along with the SAS Survival Guide pocket version)'
Given the volume of my reading and the cost of books I reread my books a lot. I also have a bunch on my computer, like the entire Gor series (and Unintended Consequences, like I said, everyone should read it)