I just finished reading "Orbit" by John J. Nance and have to say that it was one of the best books I've read in a long time (and I read 2-3 books per week).
"Orbit" is set in the not-too-distant future and tells the story of a man named Kip who's in his fifties and finding that his life hasn't turned out the way he wanted. His marriage is going badly, he doesn't care for his job, etc... Then he wins a trip on a commercial spacecraft, the dream of a lifetime.
Once in space, things go wrong and Kip is left stuck in space, alone, with no communications to the ground. Alone, with only 4 days of air, Kip begins to write his story on a laptop computer, thinking that the computer may be found in 50 or 100 years. Unbeknownst to Kip, the laptop is transmitting to the internet and people on Earth start to read his story. The real story to "Orbit" is how Kip's outlook on everything changes during his ordeal and how his words change other people's lives (his son's, people in government, and people who've never even met Kip).
"Oribit" is just out in hardback -- I was able to check it out at the library.
Happy Reading!