VS 2010–web.Config file transformations

web.Config file transformations make it extremely easy to create multiple configuration files for different environments from one main config file. (Before VS2010, you needed to create one web.config file for each environment and any changes in one had to be replicated to the other config files). Get information about the available transformations available in VS2010 at: http://msdn.microsoft.com/en-us/library/dd465326.aspx.

Also, check out the following post for a quick run down on whats possible": http://vishaljoshi.blogspot.com/2009/03/web-deployment-webconfig-transformation_23.html