How do you handle multiple web.config files for multiple environments?

Question

The way I currently handle this is by having multiple config files such as:

web.config
web.Prod.config
web.QA.config
web.Dev.config

When th

Answer 1

The way we've been doing it is to override the AppSettings section:

        
    ...

This only works for the appSettings section and so is only useful to a degree. I'd be very interested in more robust solutions.

Edit Below

Just watched this: http://channel9.msdn.com/shows/10-4/10-4-Episode-10-Making-Web-Deployment-Easier/

VS2010 has config transforms which look pretty awesome, should make multiple configurations a complete breeze.