Omar AL Zabir (author of Building a Web 2.0 Portal with ASP.NET 3.5) updated his very cool ASP.NET AJAX Portal application with 3.5 features, Workflow Foundation and new C# 3.0 features.   Play with it here:http://dropthings.omaralzabir.com 

Check out the details...

image

Update 3/29/2009:  Updated URL to site.