This little project from CodePlex is quite useful for those of you who are responsible for the Build process, Team Build, CruiseControl.NET, NANT, etc. This is the project description from their website on CodePlex:

MSBuild shell extension gives you what you've always wanted: A way of cleaning, building and rebuilding your .net projects from the explorer without needing to open Visual Studio 2005 or the Visual Studio 2005 Command Prompt. 

 It looks like this:

and when you run it, it builds the project or solution in a command window and displays the error/warnings dialog similar to the one in VisualStudio. Nice!