| Rasthorn |
The only thing I've read that I know for certain was based on a campaign would be The Hammer And The Sword & On The Anvil Of War by Jason M. Green, but I have no doubt that there are more books like that out there. I think it is a fairly good idea for someone with the ability to write a novel and/or short story to take a campaign they ran and adapt it to the page. Considering how much work goes into setting up a campaign I would think many people would have a large supply of material that can be used to make a compelling story, since that is what running a campaign is all about. Plus, it allows you to have the characters do what they should have done instead of what your players might have chosen to have the characters do and in the process mess up a great deal of planning. Granted, you would have to have the permission of the players to use their characters in the books, but then again you could always just create brand new ones to throw into whatever fantasy world you've created.