The Wilson and Stephenson offerings are relatively new (this year). The Moon is a Harsh Mistress, of course, is a classic that anyone who doesn't own, should.
None of these are new, but all of them are essential.
Others is a fantastic multi-volume history of third party politics in America. All the detail, and all the narrative zest, of Shelby Foote's The Civil War.
Radicals for Capitalism is the most extensive and readable current book-length history of the libertarian movement. It's also the only one, but it would be good even if there were others.
An Enemy of the State is a great read, even for non-Rothbardians. Don't miss it.
Burnham's The Managerial Revolution will make it easier to understand what I'm always carrying on about.
Get your Philip K. Dick on.