I'm using local windows XP IIS server to host my development projects. Most of my Web applications share same style sheets that are located in "Styles" folder on IIS root. Aspx pages links to style sheet files using link tag:
<link rel="Stylesheet" href="/Styles/MainStyle.css" />
In Visual studio 2010 IDE design view such styles are not applied. VS.NET 2010 IDE aplies only styles that held within web application.
This is working fine with VS.NET 2005. It was easy to manage style sheets that were applied to lots of web projects in one place on developer machine and also on production servers.