Silverlight:
Silverlight Roadmap questions Ashish Thapliyal
Third Silverlight v1.0 Servicing Release is Live Mike Harsh
Silverlight cross domain policy file helpers Time Heuer
ASP.NET
Expression tree usage in ASP.NET MVC Preview 2 rocks! Daniel Cazzulino
Deeper in .Net (live) - Scaling Habits of ASP.Net Derik Whittaker
ASP.NET Tips: Debugger command you may not know about Tom
AJAX
MVC and AJAX Kev Roberts
SQL 2008
The new data types in SQL Server 2008 Sergio Pereira