DropThings: Open Source ASP.NET 3.5 AJAX Portal - new and improved
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:https://dropthings.omaralzabir.com
Update 3/29/2009: Updated URL to site.