I love these as a quick, hands on way (my favorite) to get up to speed with skills and technology you may otherwise miss or take longer to catch up to.

Here is the training kit from the horse’s mouth:

The .NET Framework 3.5 Enhancements Training Kit includes presentations, hands-on labs, demos, and event materials. This content is designed to help you learn how to utilize the .NET 3.5 Enhancement features including: ASP.NET MVC, ASP.NET Dynamic Data, ASP.NET AJAX History, ASP.NET Routing, ADO.NET Data Services, ADO.NET Entity Framework, WCF 3.5 SP1, and the .NET Framework Client Profile.

Download the kit from here.

Quick note to link to the training kit released with the advent of .NET 3.5 SP1.

Complete kit with presentation & events materials, hands on labs and demos on:

• ASP.NET MVC
• ASP.NET Dynamic Data
• ASP.NET AJAX History
• ASP.NET Routing
• ADO.NET Data Services
• ADO.NET Entity Framework
• WCF 3.5 SP1
• .NET Framework Client Profile

You have (at least) two ways to achieve this:

• From within a Control, use Control.ResolveURL.

public class URLHelper

{

    public static string GetAbsoluteURL(string relativeURLPath)

    {

        return VirtualPathUtility.ToAbsolute(relativeURLPath);

    }

}

• From anywhere else where you don't have access to the control object: use the System.Web.VirtualPathUtility helper class' ToAbsolute(url) method.

// A Property of your control //

...

public string AbsoluteURL

{

    get

    {

        return this.ResolveUrl();

    }

} 

...