I think you can find all the information you are likely to want on Paul Bowles through PaulBowles.org, a link helpfully provided by a commenter.
There are a number of David Mitchell interviews out there. This one from 2000 was interesting. At the time of the interview, he had only published Ghostwritten.
Here is another interesting interview conducted just after the release of his second novel. In the interview, he talks about Ghostwritten.
ReadySteadyBook is a great literary site to check regularly. You can start with this link to their David Mitchell interview.