Code
Interesting CodePlex Tools
ASP.NET Add-in for best practices analyzer : http://www.codeplex.com/Wiki/View.aspx?ProjectName=BPAEngine
Tool to show useful information about an assembly when right clicking on it (Debug or release, Version, public token, etc.) : http://www.codeplex.com/AssemblyInformation
Patterns and Practices guidance explorer: http://www.codeplex.com/guidanceExplorer
Patterns and Practices SharePoint guidance:http://spg.codeplex.com/ (archived copy)
Tool to visualize the project dependencies in a solution: http://www.codeplex.com/dependencyvisualizer