I've been lately looking at some channel 9 videos, and found a lot of great stuff there. Two that I found particularly interesting were these: Expert to Expert: Contract Oriented Programming and Spec# Ted Neward: On Java and .NET, Software Academics versus Practioners, General Purpose Programming Languages

Can Erten created a very useful expression tree to CodeDom converter. He wrote about it here: Expression Trees-Lambdas to CodeDom Conversion. I created a visual studio debugger visualizer based on it. You can find it in attachment. Just copy the assembly to My Documents\Visual Studio 2008\Visualizers and you're set. I also attached the full source code. ExpressionCodeDomVisualizer.dll ExpressionCodeDomVisualizerSourceCode.zip

Expression trees are one of the more powerful features of C#. They let you manipulate code in ways that almost remind you of LISP macros (but at runtime instead of compile time). Since I discovered them, I managed to eliminate almost completely the usage of reflection in my code, replacing it with much faster code using techniques similar to what Roger Alsing described in Linq Expressions - Creating objects. Expression trees also made possible something that I find myself using a lot these days: what Jom[...]