We have a suite of interlinked .Net 3.5 applications. Some are web sites, some are web services, and some are windows applications. Each app currently has its own configurat
Visual Studio has a relatively obscure feature that lets you add existing items as links, which should accomplish what you're looking for. Check out Derik Whittaker's post on this topic for more detail.
Visual Studio really should make this option more visible. Nobody really thinks to click on that little arrow next to the "Add" button.