Right now I am enjoying How to Fail at Almost Everything and still Win Big by Scott Adams.
Anything You Want by Derek Sivers has been great.
Linchpin by Seth Godin was suggested by a friend across the Atlantic and it turned out to be really good.
On Writing Well by William Zinsser was great.
He writes interesting non-fiction books and reads them for the audio versions.
Just this morning on my drive into work I finished "The Men Who United the States: America's Explorers, Inventors, Eccentrics and Mavericks, and the Creation of One Nation, Indivisible". Before that was "Pacific: Silicon Chips and Surfboards, Coral Reefs and Atom Bombs, Brutal Dictators, Fading Empires, and the Coming Collision of the World's Superpowers".
Previous books of his include "The Map That Changed the World" about the first geologic map of Britain", "The Meaning of Everything" about the creation of the Oxford English Dictionary, and "Krakatoa: The Day the World Exploded". Good listens, all.
Might not fit with what you're asking for but I have to recommend the original five books in "The Hitchhiker's Guide to the Galaxy" trilogy, specifically the ones read by the author, Douglas Adams. It's one of the best narrated (and of course, written) books I've listened to. Because the author is a very proficient narrator, the books in audio form add some elements that get missed by your inner voice when reading it directly.