Ayende has (yet) another really enlightening post about the issues with the classic three layers (tiers) applications.
Jonathan Oliver has another great post about storage of events.
Eric Lippert has a very nice post clearing some of the doubts people might have around precedence operator and order of operations.
Joe Stagner points out a DotNetSlackers project that aims to clone StackOverflow.com. In the process they will use: CruiseControl.Net, NAnt, NUnit, RhinoMocks, NDepend, NCover, NDoc, ASP.NET MVC 2.0, LINQ to SQL, StructureMap, AutoMapper, Elmah, Velocity, MemCached. Keep an eye on what promises to be a very cool open source project!
Alex James published two more tips:
Julie Lerman has a very nice article about table splitting as the opposite of entity splitting.
Daniel Cazzulino shows how the power of LINQ is integrated in the next version of Moq.