It's not a book, but I've been keeping up with the journals and pictures of Dominic Gill, a young Brit who began his cycling adventure in June of last year in northern Alaska and is still on his way to Cape Horn. Last time I checked, he was in Ecuador. He's on a tandem, picking up stokers when he can. If I remember correctly, velogirl rode with him for awhile when he was in CA. Interesting reading, beautiful photos.

http://www.blue-ant.tv/takeaseat/home.php