A feature in Visual Studio Team Studio that was immediately appealing to me was shelving. The goal of this tool is replicate that general functionality in Perforce.
Project homepage:
http://code.google.com/p/p4shelf/
Programming language(s): C#,C++,Python
License: gpl2
Some source files from: p4shelf/NScriptEngine
Impl/
PyScript.cs
ScriptAbstract.cs
Properties/
AssemblyInfo.cs
bin/
Debug/
IronMath.dll
IronPython.dll
NScriptEngine.dll
Engine.cs
NScriptEngine.csproj
See more files for this project here