I immediately contradict myself. It is not recent, but it is one of the funniest books ever. And it is available in all ebook formats. I nominate A Confederacy of Dunces by John Kennedy Toole.

"But it is Ignatius--selfish, domineering, and deluded, tragic and comic and larger than life--who carries the story. He is a modern-day Quixote beset by giants of the modern age. His fragility cracks the shell of comic bluster, revealing a deep streak of melancholy beneath the antic humor. John Kennedy Toole committed suicide in 1969 and never saw the publication of his novel. Ignatius Reilly is what he left behind, a fitting memorial to a talented and tormented life." --Alix Wilber