Although you can create a seperate project targeted for .Net 3.5 framework, for your data accesss layer that uses LINQ to SQL and reference that in your ASP 2.0 web site project. When you reference the .Net3.5 data access assembly the ASP 2.0 web site will warn you, but you can ignore that use the assembly with no problem. Keep in mind you deployment web server should have .Net 3.5 installed. I have done this in one of the projects and worked out nicely.