The most important libertarian novel in the last few years (in the broad sense of civil liberties and freedom, not "report to Ayn Rand for instructions") was Cory Doctorow's Little Brother, and now Cory has released a sequel, Homeland.
(Plug for a group I belong to: The Libertarian Futurist Society, the group that gave Robert Anton Wilson his sole literary award, gave a Prometheus Award to Doctorow for Little Brother. The group gave Illuminatus! its Hall of Fame award. We will now resume regular programming after this brief commercial interruption.)
Reviewing Homeland in the Wall Street Journal, Tom Shippey wrote, "Homeland is as dead serious as 1984, as potentially important a 'novel of ideas,' with a much more engaging central character and an apparently inexhaustible supply of information on everything from brewing coffee to sneaky surveillance and how to defeat it."
I just bought a copy for my Kindle — I think Internet freedom is an important issue, so I decided to put my money where my mouth is — but as with his other books, Cory has released a free Creative Commons version. You can download it here. The link to download Little Brother for free is here.