Aram Kocharyan from TopSoft Team has published a new blog post on using MSBuild for DLL configuration files, transformations and output to referencing projects. 

What we are going to archive?

1. ProjectA (Class Library) with custom configuration file foo.config (with configuration transformations)
2. ProjectB (WebProject or ConsoleApplication, …) that references ProjectA and includes the ProjectA’s transformed configuration file foo.config (in output folder of ProjectB)

Read the full article.