.Net 2.0 support
Even though the YUIAsp.Net project is using .Net Framework 3.5, you can build it for 2.0 with a few minor changes.
In order to build it from source, you'll need to have Visual Studio 2008 and ASP.NET Ajax 1.0 installed.
First thing to do, open the properties window of the project.
In the Application tab, select .NET Framework 2.0 as Target Framework.
The last step is to remove the System.Web.Extension v3.5 reference, and add the v1.0 version.