GitExtensions

Git Extensions is a toolkit aimed to make working with Git under Windows more intuitive. The shell extension will integrate in Windows Explorer and presents a context menu on files and directories.

There is also a Visual Studio plug-in to use Git from Visual Studio. The source code of Git Extensions
Features
· Windows Explorer integration for Git
· Visual Studio (2005/2008) plug-in for Git
· Feature rich user interface for Git
· Single installer installs Git, Git Extensions and the merge tool KDiff3
· 32bit and 64bit support