I just recently completed narrating two business audio books.  One called The Subtle Art Of Managing Up:  Lead Your Boss aby John Baldoni and the other written by former New York City Mayor Ed Koch called Buzz: How To Create It And Win With It.  Both of these books from Amacom Books are excellent in terms of career building and management insight and I highly recommend them.  While I was hired to narrate these books, I walked away with a lot of great insight and information to help me in my own career.  The audio versions will be available soon, narrated by yours truly.