What should I use to develop ASP.NET 3.5 Websites?
Microsoft® has released the Visual Web Developer 2008 Express Edition for creating ASP.NET 3.5 Web applications.
Visual Web Developer 2008 Express Edition is a lightweight, easy-to-use and easy-to-learn development tool focused exclusively on Web development.
For more information, see Microsoft's official Visual Web Developer 2008 Express Edition website.